$6 NLTRN: TPNK in an unraised pot
 

I thought this was a tough spot, and I'm not sure if I should've folded. My opponent had limped offsuit aces throughout the match (limped A9o once and A3o another time), and had played pretty tightly post-flop. But, my opponent, who had recently become short stacked, could've thought I was bluffing at the pot and was trying to steal a decent sized pot. Should I just give it up on the flop? Also, would this be a call if I had something like A9.

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (2 handed)

Button (t655)
Hero (t2345)

Preflop: Hero is BB with 4[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
Button calls t25, Hero checks.

Flop: (t100) 6[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t70</font>, <font color="#CC3333">Button raises to t605</font>, Hero calls t535.

Re: $6 NLTRN: TPNK in an unraised pot
 

No and yes respectively. He has 12 BB's, people will shove all kinds of crap when shortstacked. His range is way wider than an A.