And you don't know exactly when the whistle was called with that picture. There's also another view of this picture:
It looks like the ref was calling it on Dirk for the hand on the back. There was contact-no doubt about that..but that's an extremely ticky tack foul to call on the last play-especially since Wade completely straight armed Terry and hooked Josh before getting to the basket. Obviously, the Mavs aren't going to get much sympathy from Spurs fans but it really is a shame that the NBA and its officials have played such a BIG role in determining so much of the outcomes in the playoffs(not just the finals).