When a SWAT team, or military unit shoots a terrorist, they move on to the next room. To prevent a wounded person from getting up, a shot to the head 'anchors' the body. Any units entering the room will ALSO anchor shot, just in case. (Body might be found with one to the chest, and six holes in the head, just because.)

(Rumored to have started with Israeli Anti-terrorist units.)
"Hey, you got some brain on you...

Yeah, I was a little close on that anchor shot on the second floor."
by Boom-Headshot! June 29, 2011
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