reason for doing that, if it was on your person, it can't be anywhere else. >> reporter: it was on his person the night he encountered trayvon martin. he told osterman how he grabbed it during the fight. >> according to what he told me, when the head bashing on the concrete stopped and trayvon reached for the firearm that was at his side, grabbed ahold of it. >> reporter: osterman quoted it in a book. somehow i broke his handle on the gun. i got the gun in my hand, raised it towards the guy's chest and pulled the trigger. and this is where the problem lies for george zimmerman because comments quoted by his friend ossterman do not match what zimmerman told police. listen to what he says as he walks investigators through the crime scene. >> and he reached for it. i felt his arm going down to my