As a former official myself, the last call is debatable. When I got my official traning the clear line between a charge and block was the issue of advantage. In fact the issue of a defensive player moving had no real relevance in the determinance of a block. The feet don't have to be anchored, but the defender has to be in such a position that his displacement was caused by the offensive player moving through him. If the official determined the defensive player reached the point before the offensive player did, then the call is relatively easy. Charge.
The last call from hindsight probably exhibited a clear advantage for the offense, not the defense. At that moment in the game, as we are told an official cannot change his calls based upon the time of the game. Unfortunately humans being humans, that isn't a guarantee. That was a charge earlier in the game, and to a point the charge on Wood with 2 seconds left in the first half. Though admittedly, Wood's charge was far more obvious.
Look, I much as everyone was irritated by the type of officiating last night, but we have such a limited offense at times we aren't going to put the same type of pick and roll pressure UNC did. As a coach I have been on the winning side of events like this, and lost games because of FT advantage.
Bummer way to end the year, not how a team wants to go out. i do wish the best for UNC in the NCAA's.