Flopped set on scary board.

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MP1 has only $12 left? I check, if he goes all-in and SB folds call.

If SB comes alive and goes all-in you can fold.

If SB calls, well, thats tricky, and I'd like to know more about the game and players to decide whether to call or fold there.

Betting doesn't seem worthwhile, I can't see anyone calling without the straight. With deeper stacks you could bet about 40% and fold to a raise, but here if you make a bet of this size I think you are committing to a raise (which sux with that board).

One other alternative, bet $10 and get calls from the pair of 7s (or 2 pair 7s and whatever) they both have.