Question for those who know MLB rules better than me:

Say Holliday was blocked from home plate and didn't tag. However, the catcher never had possesion of the ball, and can't legally block him from the plate. Would be no different than the 2nd baseman not having the ball and knocking over a baserunner on his way to second -- the baserunner would be awarded the base because you can't block him.

Doesn't the same apply at home? The catcher didn't have the ball and blocked him from tagging home, thus meaning he should be safe no matter what, correct?