Stars 11R - the loudmouth and the donkey

Final 2 tables of morning 11R on stars - 12 players remain. 1st pays nearly $3300.
Blinds are 4k/8k with 400 ante.
A little history - UTG in this hand has been openraising with all kinds of trash. He busted someone earlier calling off all his chips with 63o and sucked out a straight versus a PP. He's made LOTS of these plays, calling huge raises claiming he thought he was pot committed when he clearly wasn't. He actually has no clue what pot committed means and that's very evident. MP in this hand has been urging the table to stand up to the UTG chipleader who was bullying like any good chipleader should. MP has recently donked off about 80k in chips. Just before this hand UTG challenged MP to push into him and said he would call. Is the isolation ok here or should I back down and let them fight it out?

PokerStars No-Limit Hold'em Tourney, Big Blind is t8000 (6 handed) converter

UTG (t226673)
MP (t39479)
CO (t86584)
Button (t378936)
Hero (t122780)
BB (t126595)

Preflop: Hero is SB with Q[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">UTG raises to t24000</font>, <font color="#CC3333">MP raises to t39079</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t122380</font>