edward norton. but this is no hollywood movie and what makes these fight tapes so shocking is that the teens appear to be well cared for kids from anywhere, usa. clarkchris lawrence. >> i was really struck by the -- just the abject disrespect and disregard for human life. we saw people being stomped, people being hit with hammers. >> [ bleep ]. >> people being kicked in the head. it was horrific. and it terrified me. >> get this. >> [ bleep ]. >> these are kids who are addicted to violence. >> get him! get him! >> and who are fighting for the sake of the high that it brings watching that fight. >> what gets the d.a.'s attention that summer can a horrifying story about tanner hanson and the night he encounters the 311 boys. >> this is where it all started. >> july 18th, 2003. tanner hanson has just wrapped up his junior year in high school and is enjoying all the graduation parties with his friends. on a warm saturday night, tanner drives to this park where he meets his best friend craig. some girls show up. and one of them suggests going to a party. another friend winces at the idea. but the group decides to go anyway. that's a decision tanner now w