mercilessly guns him down. then he kills 31-year-old worker dennis sargent. in the panic a few people are able to escape the store. zack is working in the back when he hears those shots. >> i looked down the aisle. i saw chuck lios on the ground just covered in blood. it still didn't click in my head that something was wrong. i started walking backwards and i found myself in the produce department. >> this is the view from the store camera covering the produce section. >> the floor crew guy that waxes the floors, he just runs right past me, and i knew something was wrong then. and i kept walking backwards. i was going to go towards the back room. >> but zack had just made the biggest mistake of his life. zane floyd is coming around the corner with a shotgun. >> there's tables in produce that have all the fruits and vegetables. and i dove between one of those, just trying to get down. and he takes a shot at me. and i'm ducking under the table. and it goes over my head. he's chasing me around, and i'm just scrambling, trying to get