Turn decision

[CruS]

Villain is a good TAG..

Full Tilt No-Limit Hold'em, $0.25 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($12.15)
SB ($26.15)
BB ($25)
UTG ($25.80)
MP ($19.90)
Hero ($28.60)

Preflop: Hero is CO with A[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.85</font>, <font color="#666666">1 fold</font>, SB calls $0.75, BB calls $0.60.

Flop: ($2.55) 5[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets $2.2</font>, Hero calls $2.20, SB folds.

Turn: ($6.95) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $5</font>

What is ABC poker here?
(Yes I know I posted parts of this hand before and asked the same question, but me and a friend had a discussion over it and we were on very different tracks on what to do...)