having already committed 900, and being asked to commit only 1295 more, I would say he is pot committed. also, looking at taking a pot that will be a total of 4840, he only needs to win something like 1 in 3.5 to make it a profitable move.... the only danger he has here is that he is dominated by AJ or AK..... but I think that"s a chance he has to take.
pretty standard call IMO