>> the gunman fires a single shot striking sergeant kellermann in the face.ç >> i was still trying to communicate with him and he was trying to put the gun down and trying to get some kind of demeanor with him. i don't remember the gun blast. i remember hearing it, and i knew it was him that shot, and i felt the percussion on my face. >> just as i was about to fire my first shot, he shot. and it kind of distracted me for a second. shortly after he shot, i fired my first shot. and you see the window on the car that he's leaning on blow out. that was my first shot. >> in an instant, several officers open fire on the gunman, as officer tyson riley races to the aid of sergeant kellermann. >> the other officers that were there, i trust them with my life. i knew that they were going to do anything a they could do to protect me and sergeant kellermann. and at that point i chose to holster my weapon and go to him.