I'm trying to get to the room with all of the hostages and Ames in it, I've looked on guides and it says all I have to do is is push square behind the guard to choke him, so that I can get his face into the retinal scanner, but what winds up happening is for some reason, Raiden feels the need to trip the guard over instead of hold him hostage.
Then I wind up having to beat the ever loving crap out of the guard, knocking him out, when I try dragging him to the retinal scanner, I can't seem to get Raiden to scan his eyes so I can get into the room.
What do I do?

