The most i have played is $100NL. That being as it may , my less schooled opinion is as follows:

1. referring to the Fundamental Theory of Poker, you call.

2. it's the 2 minute pause that convinces me he has trips and has reviewed your play so far at table, and figured you to not have AA. I put him on QQ. He's not pushing with A,9 and that's all you beat here. Fold.