OK, thanks for the feedback guys.
I thought pushing was the correct play as well. Clearly A5s is too good to fold this late, even a min-raise puts 31% of my chips in and calling is the worst of all.
All that said, I here's how I completely butchered this...
Party Poker No-Limit Hold'em Tourney, Big Blind is t300 (3 handed)
converter
saw flop|
<font color="C00000">saw showdown</font>
Button (t3450)
<font color="C00000">Hero (t1930)</font>
<font color="C00000">BB (t2620)</font>
Preflop: Hero is SB with A[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img].
Button folds, <font color="CC3333">Hero raises to t750</font>, BB calls t450.
Flop: (t1500) T[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">Hero bets t750</font>, BB calls t750.
Turn: (t3000) 7[img]/images/graemlins/club.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">Hero bets t430 (All-In)</font>, BB calls t430.
River: (t3860) A[img]/images/graemlins/heart.gif[/img] <font color="blue">(2 players, 1 all-in)</font>
Final Pot: t3860
Results in white below: <font color="white">
Hero has As 5s (one pair, aces).
BB has 8s Ks (straight, jack high).
Outcome: BB wins t3860. </font>
While I think BB's call both pre-flop and on the flop are terrible (if he's going to play this, he should push in both cases... anyone agree?), I clearly missed my chance pre-flop.