allen C. rereraise on river with three AAA, can't be good

Yeah there is no way Williamson raises with just 3 aces in that spot, in fact he probably folds there with a player still to act and the first pos. man betting out. I was thinking though - what if Williamson just calls behind Hellmuth - does Allen then raise the trips as a semi-bluff or a sort of squeeze, assuming he only needs to get Hellmuth to fold? (Of course this would never happen as RW3 never flatcalls with A's full.)