50NL AK vs preflop aggressor

[pokahpaul]

PokerStars No-Limit Hold'em, $0.50 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($48.55)
Button ($36.55)
SB ($83.70)
Hero ($54.40)

Preflop: Hero is BB with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">SB raises to $1.5</font>, <font color="#CC3333">Hero raises to $5</font>, <font color="#CC3333">SB raises to $8.5</font>, Hero calls $3.50.

Flop: ($17) 2[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $14.5</font>, <font color="#CC3333">SB raises to $68.5</font>, Hero calls $31.40 (All-In).

Turn: ($131.40) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

River: ($131.40) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: $131.40

villain is 24/16/5

i was a bit thrown off by his mini 4bet preflop OOP and figured he was strong. but when the flop came with an A, i figured he held a hand like KK-TT.

how should my thought process have gone through this hand??