limit because i think i'm unstoppable. i think nothing can stop me. nothing will ever kill me. i thought i would die. reality check. i'm not. >> in spite of his calm demeanor, a few hours after this interview, etter got into a verbal confrontation with a female correctional officer that quickly escalated. sert, the correctional emergency response team, was called in to extract him from his cell. >> d-11. he's banging his head on the door, banging the glass, refusing to comply with the orders. got permission to extract him from the cell. >> for security reasons the prison videotapes all extractions. >> you ready to move? keep your hands down. all the way. >> open b-11. >> a mask is placed over his head to prevent him from spitting. >> let's go. initially he seems to be compliant. but as they pass through the doorway etter explodes.