hit him again ...

I'd raise for 2/3 ish of the pot - and then call any reraise.

there are only 2 possible hands he has that beat you A6 or A10 - unless he's slowplaying AA or TT or lucked out with QQ. I'd say it's pretty likely he missed a flush draw and will fold to your river bet.[1]




[1] - highly recommend taking a few large pinches of salt with this advice on the grounds that I'm still new here...