Watching silently as Kurt checked the weapon for bullets--was there anything his boyfriend couldn't do??--Blaine worried his lower lip and glanced over his shoulder again toward the doors, afraid of something sneaking up on them. He jumped, and barely kept himself from screeching when the gun went off the first time, and was only a little bit prepared for the second shot.
Eyes wide, he followed Burt forward as the man glanced around the corner and reached out to pat Kurt on the shoulder. Blaine's mouth was slightly agape at the fact that Kurt had shot the first two clean in the head. He didn't know if he should be impressed or terrified.
Of course, the other two were drawn by the sound of the shots, and heading down the hall toward them.