TPGK - call his early push??

[Beck]

Pokerroom 20+2
one of the very first hands of tourney blinds 10/20

Hero get AhQc in MP, raise to 70, button and blinds come along, for a total pot of 280.

Flop is As9hTh
SB bets 100, BB folds, I raise to 300, Button folds, SB goes all in, Hero???