mark barton made a right into the lot of the bp gas station with clemens behind him. >> with barton cornered at the gas station and concern for the safety of innocent bystanders, the officers now had to be ready for anything. >> what's he going to do next? what's mark barton's next plan of action? he's boxed in. i'm in front of him. another car behind him. what's going through his mind? is he going to jump out shooting at myself, officer clemens, or shooting at the citizens at the gas pumps? >> to be honest with you, i was tense. i didn't want to make any mistakes. >> there was a heavy sun glare and as i was watching i saw a flash of silver go up. >> i was looking for glass breakage, door openings. >> we saw the muzzle flash and heard the gun pop. >> with guns drawn, officers