A blind stealing hand

[TripleQ]

Background:

PS 30+3 tourney. About 80 people left out of 300ish?, top 50 or so get paid. Table was very tight, I had been stealing about 30% of the time from all positions and constantly won the blinds. Except once, I raised from mid/late position, SB reraised me (not all-in) and I had to fold.

The hand:

Folded to me on the button with 99. I have about 11,000 avg stack 7000, BB has just under 11,000. Blinds 300/600. I raise to 1800. BB (same person who re-raised me before) thinks for about 2 seconds, then re-raises all-in. He had been TAG, raising preflop occassionally, and if called, pretty much betting out on any flop and not showing down.

What do you do?

Results later...