I'd probably fold this and wait for a better opportunity. Here's why:

Against a set (88,44), we're behind about 30/70. Zero chance of fold equity.

Against 2 pair, we're about 45/55. Might get some fold equity here, but it's still pretty even.

Against overpairs (KK/AA), we're almost dead even, but we get a lot better fold equity, imo.

I don't see A9 reraising like this at all.

So, it comes down to how you know the player handles preflop situations. With only a $2 call here, and no re-raise, I'm guessing he's on a set or 2-pair.

Just my 2 cents.

Anyone else?