>> but then in that instant mecham remembers a video he sue in rookie school. it was a 1992 traffic stop in south carolina with a state trooper named mark kotz. >> 21! >> trooper kotz was shot, called in for help, and the suspect was laying in front of him, and he got shot and he died. and that video immediately went through my mind, get cover. get behind something. and i sprinted for the back of my patrol car, and as soon as i got to the back of it, he knelt up in the ditch and fired three more shots. >> 331, signal zero. i've been shot at, and i have hit the subject. get on the ground! get on the ground! >> a few miles away, deputy sheriff ron simmons hears corporal mecham's call for help. >> he was saying words to the effect if i don't know if i've been shot. shots have been fired.