enforcement, joins driscoll in the pursuit. >> i was coming up to highway 93 by sumner. the police chief, dennis cain, was coming out of sumner with his lights and sirens on. i slowed down, let him make the corner to head south. he made that corner and i was in behind him at that point in time. so, he's the lead in the chase. >> at the next intersection, chief cain overshoots the corner. now driscoll is in the lead. mumford now unloads a barrage of gunfire at officer driscoll. >> shots fired! shots fired! >> it sounded like a rock hit my car. i thought to myself, i'm not close enough to them for that to be a rock. >> moments later a bullet slams through the center of driscoll's windshield just to the right of where his dash cam is pointing. >> it blew out my back window. put shards all over my back