From what I saw, the #3 or the #4 guy in the door shot over the top of his buddies. I would be more than a bit pissed at the mission debriefing! That guy would have a big dent in his helmet!
Man, it seems like one flashbang and one clean shot would have done the same thing as the 17 shots they fired. I am sure that at least a few of those went through those walls and into surrounding apartments.
I agree, everyone else seemed to be business as usual. If I was carrying the blanks, I wouldn't be the third guy in... Or if I was, it would be in and around the inside frame of the door to stay the hell out of the way. I wonder if he drew the short straw.
Yeah looks like those were intentional shots aimed at the ceiling. Designed to scare the guy and hopefully stun him for a second or two so the guys in front could get him.