mark twitchell thought bill clark was a dumb cop. twitchell was trying to play him.re reading him, during that interview, he had been reading you. >> no doubt. >> reporter: he made some, probably had made some judgments about your ability as an interviewer. what did he think of you, do you think, during that interview? >> i think he didn't think i was that smart. i think he thought he was smarter than me. and i believe that he felt that anything he told us he could concoct to make us believe him. and of course there is only one proper response to that. >> i just let him go and then i take him back through it question and answer. standard procedure. just nail down the details now. start nailing them down. now i'm starting to see he's not remembering specific details. let's go back to lunch. you're at lunch. where do you go from lunch? >> i don't remember. >> you don't know where you went for lunch? >> no. >> reporter: so now it was early morning. they'd been at it for hours. they had taken a break. they'd let mark twitchell sit by himself and, perhaps, stew a bit. now