So here's my question: how do the order "AIM" and "blowthrough ability" work together? Say one marine discards his AIM ORDER in order to (no pun intended) make an aimed attack with the chaingun. Can I re-roll JUST the first attack and then walk normally the attack, or can I re-roll the first attack AND every attack I walk into other enemies, meaning by that I can make up to three attacks re-rolling the dice in the same turn with just one order?
In addition: I know I can walk a shotgun shot 2 times through a mancubus, demon, hellknight, cyberdemon, as far as I have line of sight, ammo, etc. But can I walk the chaingun three times through any of them, meaning by that I target spaces A, B, then A again , for it's an adjacent space to B??