[Eagles]

This hand takes place with like 45 People left. ITM Blinds are 800/1600/200.

8 handed

UTG + 1 has 160k he has been playing fairly tight, not overly tight but about what you would except for a full ring game. Hasn't really got involved in many big pots.
SB has 80k he has been playing looser and more passive. Not a big call box but he's been cold calling some pfrs and stuff. He's not going to stack off super light or anything.
BB has 40k Playing pretty solid he has been short so hasn't really played many pots but seems to have some idea how to pushbot etc..

UTG +1 raises t4200 folds to SB calls BB tanks for a bit and overcalls.

Flop is A8Tr
BB checks SB thinks for a bout 20 seconds and bets 9k into 15k pot.

What do you think SB has?