With the age of the game (and 40K before that), I'm sure this must have been answered online or by the Roolz Boyz in White Dwarf.
tl;dr Do you have to declare immediately when you want to shoot, or can you wait and say "I would have shot him then"?
The long version: I had two guys in cover, and needed them to run around a corner. I knew this would expose them to an enemy model on overwatch, so I sent out the... "more expendable" guy first. When the second (better) ganger fell over in the "sludgy surface" treacherous condition, my opponent said "if he's not coming, I'll shoot at the first guy instead". Which led to a debate over the rule. I felt that in reality, the overwatch model wouldn't be able to go back in time after seeing no one else appear, and shoot the first ganger emerging.
What's the official word on this, as I'm sure it covers 2nd Edition 40K as well.
tl;dr Do you have to declare immediately when you want to shoot, or can you wait and say "I would have shot him then"?
The long version: I had two guys in cover, and needed them to run around a corner. I knew this would expose them to an enemy model on overwatch, so I sent out the... "more expendable" guy first. When the second (better) ganger fell over in the "sludgy surface" treacherous condition, my opponent said "if he's not coming, I'll shoot at the first guy instead". Which led to a debate over the rule. I felt that in reality, the overwatch model wouldn't be able to go back in time after seeing no one else appear, and shoot the first ganger emerging.
What's the official word on this, as I'm sure it covers 2nd Edition 40K as well.