AAA2s, in a tourney situation

[Zophar]

400/800 blinds at a small Horse MTT final table, 7 handed.
UTG Folds
UTG +1(1,042) raises to 800
MP (6,464)raises to 1200
Hero (3,545) AcAhAs2h

Is this an insta fold or reraise? Or does it's low strength, suited A2, top pair showdown value and the fact that there are fewer possiblities for low because of the 3rd ace make it playable?

I figured the case ace was out, and was hesitant to commit more than 1/3rd of my stack. So I folded.

If it was A2sAX, I'm pushing this for sure.

If my stack were reversed w/MP would that change anything?