AJ facing obvious tilt push re-raise and call

[JesseB_11]

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP2 (t2515)
MP3 (t945)
CO (t1743)
Button (t1015)
SB (t2015)
BB (t2205)
UTG (t4120)
Hero (t1965)
MP1 (t3982)

Preflop: Hero is UTG+1 with J[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t150</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">MP3 raises to t945</font>, <font color="#666666">2 folds</font>, SB calls t920, <font color="#666666">1 fold</font>, Hero??

This is from the 10 dollar 15,000 Gtd. MP3 just lost a huge hand when he called all in on 4 diamond board that had a pair with the 4 of diamonds. With that said he seems pretty bad. No read on SB. I know I have MP3 beat but SB's call for his his stack confuses me. Thoughts?