This confused me - 2 parter

[Matt Flynn]

10-handed $10-25 UB

Me: UTG with $4823.
UTG+1 irrelevant.
UTG+2 $301 and slinging
UTG+3 $789 revved but not slinging
UTG+4 irrelevant
UTG+5 irrelevant
CO irrelevant
Button irrelevant
SB irrelevant
BB $6600.50 and playing tight postflop.

Me: 9h 9d

Pre-flop:

I call. UTG+3 raises to $50. UTG+4 calls. BB calls. I call.

Flop (board: 6c 8d 9s): Pot = $210.

BB checks.
I check. Anybody play it different? Likelihood of one of t
hem moving on the pot was high.
UTG+3 goes all-in for $251.
UTG+4 calls (!) UTG+4 is bad but not a dingleberry.
BB raises to $625.

I ?????

Matt