...knew it would take some force to stop the guy from rolling to to the basket. He was going to get run over if he didn't exert some force, and he wasn't going to stop the guy from rolling to the basket without exerting a LOT of force.

Now - it was still a foul and coulda/shoulda been called as one. Then again - they were letting a ton of physical stuff go all game long, so it isn't surprising it wasn't called either.