Hansborough was no more interested in a blocked shot than Haslem was. He swung two arms at his head, then used one hand to jack him in the back and the other to rake his face hard enough to lay him open over the eye. Just because the ball happened to be deflected has nothing to do with the fact that Hansborough was trying to clobber him. If the refs had given Hansborough a Flagrant 2, that would have put a stop to it right then. But they didn't, so Haslem gave him some of his own medicine and the refs called it the same way just like they should have. Things didn't get any worse after that and it was then probably the cleanest game of the series until the scrubs came on late.
If I'm running the crew in Game 6, I go to both coaches before the game and make sure they understand that there is no such thing as a Flagrant 1 tonight. The first (and second and third and fourth) guy to blatantly hammer somebody is leaving, no questions asked. If that doesn't put an end to it, then teams are welcome to play short-handed.