[Gramps]

The only time I might check that down is if you're "back on the bubble" yourself (at risk of finishing out of the money) if the all-in player wins the hand - then it might be to your gain to keep the other player in who might draw out on the SB if SB is ahead, etc....

...however, with two very short stacks and a large stack yourself, you have about zero chance of finishing out of the money here, no delicate considerations to complicate matters here. Fire off a bet with your 2nd pair. My gosh, that's 1200 chips in there, don't puss out and let UTG draw out on you. You're going to be in a HU contest it looks like, those 1200 chips are quite vaulable in that contest.

Don't listen to the whiners - your only job is to play good poker. Betting that flop in this cirucmstance is CLEARLY good poker.

If UTG calls you, then check it down. If he's a biatch and "spite bets" you out of the pot on the Turn/River with a nothing hand, well...that doesn't happen very often...you'll still be able to get to the final two the vast majority of the time...and you only risked 400 chips at that 1200 pot...