Twice, Asher gets his intended mark to open their door by blowing cigarette smoke at at fire system sprinkler head which sets off the fire alarm. This type of sprinkler head is activated by heat or flame, not smoke.
A little after the 48 minute mark Asher (Ron Perlman) is shooting at some bottles, there is no muzzle flash on his first shot, also after his first shot he cycles the bolt on his rifle but no spent cartridge is ejected and no fresh round loaded from the magazine, on his subsequent three shots it also appears there are no cartridges ejected when he cycles the bolt.