I keep hearing how people question Pantera's chin because he did a little dance after Eastman rocked him the the 6th.
What is a definition of a weak chin?

The way I see it is after he got dazed he came back strong and KO'd Eastman 2 minutes later. Would you not call this a strong chin? Able to take such a clean hit in the temple, shake it off quickly and win the fight.

If anything people should be asking WHY he was open to take such a punch. He may need to improve his defense, but that has nothing to do with his chin.