I agree that, normally, that should have been called. However, the refs in that game were clearly trying to let the players play and get out of the way, which I like. There were other similar no-calls earlier in the game, so I'm OK with that one not being called.
(And I was rooting for the 9ers for the record.)
Yup. That is one of the great things about playoffs and Super Bowl. The hits are a bit harder and players are allowed to play.