Corbett’s lawyers contend that he acted lawfully in self-defense after being threatened; prosecutors contend the shooting wasn’t justified.

Uh, yeah, right! Kid is on his knees, rogue BP agent comes up behind him and stikes him on the side of the head while casually holding his weapon in his left hand, which just "happens" to discharge? And the asswipes excuse? He was going to throw a rock at me!

Sounds to me like the kid was cooperating!