Mid tournie - call this bet from the BS?

William Hill £10
90 riders, 40 left.
I've been solid, chips up and down but all anyone has seen is my cards being the best hand when the money went in. Suizital recently doubled through. Mazarron seems like a good player and I'm expecting him to make a move soon. The BS has been playing well and showing good cards but getting action because he's been stealing, as you'd expect with his stack.

Fold, call or push?

I'm in the BB.
Blinds 100/200) Table "Tourney 1575499 - 3" Seat 8 is the button.
Seat 1: Registrar (3280 in chips)
Seat 2: Mazarron (2270 in chips)
Seat 3: JBK456 (5120 in chips)
Seat 4: Robpam001 (3275 in chips)
Seat 5: SuiZital (2800 in chips)
Seat 6: capefear (2760 in chips)
Seat 8: kjakan99 (8070 in chips)
Seat 9: tekgun (2175 in chips)
tekgun: posts small blind 100
Registrar: posts big blind 200
----- HOLE CARDS -----
dealt to Registrar [Ac 9c]
Aljo0146 sits back
GanjaGoo sits back
Mazarron: calls 200
JBK456: folds
Robpam001: folds
SuiZital: calls 200
capefear: folds
kjakan99: raises to 600
tekgun: folds
Registrar: ?

I initially though that a push would be out of the question and calling made sense. Then I thought some more.

1300 in pot now, which is over 1/3 your stack.
Calling would be over 10% of your stack, which you would then have to fold on most flops.

Unless they were slowplaying a big pair and planning on a reraise, both limpers should fold to a push.

Would the big stack fold?
Probably yes, as he's not going to call off almost half his remaining chips without a really strong hand.
If not, then you can still outflop him.

So my initial gut reaction was way too weak/passive.

1) Push
2) Fold
3) Call

......in that order, with Calling being way worse than Pushing or Folding.