Field save?

[Thorgor]

That's true, it does make a difference with field armor. Our group has never used field armor before, so it never came up. And who says having extra effects like that is a bad thing? Still, your second paragraph acknowledges the roll coming after the Wound roll is just to reduce the number of dice rolls. So they've admitted that, logically, it should come before the Wound roll.

Oh, yes, definitely. However, the hit-wound-save sequence is deeply ingrained in GW's DNA by now, and they seem unable (or unwilling) to challenge it.
I'm not saying that field armours triggering more often is a bad thing, but it sure is a different thing from what is (likely) intended.
If you want to houserule a hit-save-wound sequence, you will also have to change how seismic works (as it may deny a save roll based on the result of the wound roll) — or just choose not to use the corresponding weapon mind you ^^. It could be as simple as basing the no-save-allowed on a natural 6 to hit though.

Speaking of illogical weird things, it's also very strange that a fighter can choose to use their conventional armour save instead of their field armour save. How slow are those bullets if a fighter has the time to deactivate their force-field before they are hit? In the end, it all boils down to abstracted game mechanics.

Those rules that state "ignore the attack" do that.

Do they though?
It seems that they either say "The attack misses" (and in this case, the fighter shouldn't be Pinned, yes) or "The attack has no further effect" (and in this case the fighter should stay Pinned as Pinning already happened and is therefore not part of the "further effects")
Step aside and Omen of fortune use the former, while Dodge and Field armour use the latter (which is yet another hint that they happen after the wound roll is made)

In my opinion, the intended sequence is:

1. Hit roll
2. Omen of fortune
3. Step aside
4. Wound roll
5. Dodge
6. Save roll (Conventional armour save OR Field armour save OR Precognition)
7. Injury roll

Note: even if a Maul grants a Caryatid a 6+ armour save you still can only make one save roll per wound, and the 4+ save from precognition is better

 

[UncleFester]

If you want to houserule a hit-save-wound sequence, you will also have to change how seismic works (as it may deny a save roll based on the result of the wound roll) — or just choose not to use the corresponding weapon mind you ^^. It could be as simple as basing the no-save-allowed on a natural 6 to hit though.

Good catch. We've never had anyone use a Seismic weapon either. LOL. Another solution is to use the result of the firepower die, which you're already rolling for the ammo-check anyway (3-hits is a 1-in-6 chance.) I find it curious they really don't explain what the seismic trait does. Does it shake the ground? And you get shook so hard, it ignores your armor? Just wondering what the reasoning is so I can understand it better...

But makes me think of the other thing I always wondered... Why do you get an armor save when falling? I, fortunately enough, have never fallen from about 15 feet wearing armor, but it seems strange that it would help me much. But whatever - it's a mechanic...

 

[Warpman]

It seems that they either say "The attack misses" (and in this case, the fighter shouldn't be Pinned, yes) or "The attack has no further effect" (and in this case the fighter should stay Pinned as Pinning already happened and is therefore not part of the "further effects")
Step aside and Omen of fortune use the former, while Dodge and Field armour use the latter (which is yet another hint that they happen after the wound roll is made)

In my opinion, the intended sequence is:

1. Hit roll
2. Omen of fortune
3. Step aside
4. Wound roll
5. Dodge
6. Save roll (Conventional armour save OR Field armour save OR Precognition)
7. Injury roll

Note: even if a Maul grants a Caryatid a 6+ armour save you still can only make one save roll per wound, and the 4+ save from precognition is better

IF that roll happens precisely when it is written to happen, after Hit is scored (and we do not ignore RAW, putting it in Armour save step after wound roll(or analogue) happened
Pinning had not yet happened, scattershot has not yet happened.
In the end all we need is to decide to ourselves, is it the general paragraph wrong (that names it a save and prescribes us to use it instead of armour save roll) or the wording of the ability is wrong, and it is an invulnerable save that replaces the armour save roll in those super rare conditions (AP-2 or greater) when it's actually better than armour roll (for that level of rarity and price, of course.

Lack of terms used is the bane of GeeDubs writing, yes. Up to every community to decide what was intended and if the intention is clear or worthy.
Just saying "Ganger gets 5+ invulnerable save" is much more GW-ish, but they went so far as to actually write a special rule instead.

Good catch. We've never had anyone use a Seismic weapon either. LOL. Another solution is to use the result of the firepower die, which you're already rolling for the ammo-check anyway (3-hits is a 1-in-6 chance.) I find it curious they really don't explain what the seismic trait does. Does it shake the ground? And you get shook so hard, it ignores your armor? Just wondering what the reasoning is so I can understand it better...

But makes me think of the other thing I always wondered... Why do you get an armor save when falling? I, fortunately enough, have never fallen from about 15 feet wearing armor, but it seems strange that it would help me much. But whatever - it's a mechanic...

Seismic feels like an afterthought, referring to all saves, not just Armour saves. Effectively you can shake a demon (familiar) to death with it.

Armour against falling is GeeDubs meme.
You know, like STORM RAVEN BLASTED IN THE SKIES
WHOLE SQUAD FALLING TO THE GROUND AT METEOR SPEED
3++ STORM SHIELDS ENGAGED
FNP FROM APOTHECARY
2\9 MORTALITY RATE, SQUAD SUCCESSFULLY LANDED ON THEIR SHIELDS

===thought of the day===
Never go skydiving without a stormshield

 

[Thorgor]

But makes me think of the other thing I always wondered... Why do you get an armor save when falling? I, fortunately enough, have never fallen from about 15 feet wearing armor, but it seems strange that it would help me much. But whatever - it's a mechanic...

I'm no expert, but according to a very quick and superficial google search body armour actually helps against falling damage. So I'm gonna give them the benefice of the doubt on this one.

In the end all we need is to decide to ourselves, is it the general paragraph wrong (that names it a save and prescribes us to use it instead of armour save roll) or the wording of the ability is wrong, and it is an invulnerable save that replaces the armour save roll in those super rare conditions (AP-2 or greater) when it's actually better than armour roll (for that level of rarity and price, of course.

Or we could ask them!

Price wise, you can get an invulnerable save of 5+ (plus the occasional flashbang) for 60c, while a conventional armour save of 4+ costs 40c and a 3+ costs 105c (unless you are Van Saar or Orlock, then it's cheaper). It doesn't seem that overpriced to me. Whether or not it's worth the price compared to conventional armour will mostly depend on the weapons used in your meta I guess.

 

[Warpman]

Or we could ask them!

Price wise, you can get an invulnerable save of 5+ (plus the occasional flashbang) for 60c, while a conventional armour save of 4+ costs 40c and a 3+ costs 105c (unless you are Van Saar or Orlock, then it's cheaper). It doesn't seem that overpriced to me. Whether or not it's worth the price compared to conventional armour will mostly depend on the weapons used in your meta I guess.

Rarity and cost of mesh+undersuit is greatly lower (40 versus 60) and is as good (or better) unless you get hit by some super hardcore anti-tank gun with AP-2
And that is: Needler; GL ;Overheat plasma; Melta and some super-useless unwieldy guns.
Your average is AP - and AP-1 (boltguns, plasma, swords,)

As far as it goes, asking GeeDubs tends to create new questions, not answer existing ones. N18 feels an example of it, they just simplify things instead.
Just ask your company running GM and settle it for the time. meta is different and that is great