premise: But we know that at 10:31 , General Larry Arnold instructed his staff to broadcast the following over a NORAD instant messaging 10:31 Vice president has cleared to us to intercept tracks of interest and shoot them down if they do not respond per [ General Arnold ] .
hypothesis: General Larry Arnold told his staff to broadcast over a NORAD messaging serivce at 10:31 that the Vice president had authorized the shooting down of hijacked planes .