also with us is michael hull, director of the new hbo documentary film "betrayal at attica."this conversation between president nixon and the new york governor nelson rockefeller. david rothenberg, your thoughts on what happened and why when you were negotiating with so many others between the prisoners in the state rockefeller decided to simply have the troopers opened fire? >> amy, we were brought in as observers. the negotiators were the inmates. some of the observers like bill kunstler and congressman video and tom wicker, little more sophisticated than people like myself who are new in this whole arena. they're giving advice. but what had happened is in the takeover, said earlier that one of the guards had been beaten up and two of the inmates in the takeover. officer quinn during the negotiations, the word came out that officer kueng had died. that changed the whole talk of the negotiations because amnesty was taken off the tle. the irony of that for me and i always say this, i brought nothing to what happened to t yard that day. i was an observer. what i came away with