AQ, but timing confuses me

[recallme]

I was debating yesterday to post or not post this hand and after rethinking it today i finally decided to post it.
First, i am aware, that i can`t misplay that hand very much, because every action ( not b/f) is viable.
2nd i was totally confused about the timing:
He used his timebank down to 10-5 secs on the flop. During this time i was already trying to find a line for the turn.

Poker Stars
No Limit Holdem Ring game
Blinds: $25/$50
9 players
Converter

Stack sizes:
UTG: $1150
UTG+1: $4953.50
MP1: $675
MP2: $5562
MP3: $4975
CO: $925
Button: $4498
Hero: $4950
BB: $901

Pre-flop: (9 players) Hero is SB with A[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/heart.gif[/img]
6 folds, <font color="#cc0000">Button raises to $150</font>, <font color="#cc0000">Hero raises to $550</font>, BB folds, Button calls.

Flop: 6[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/club.gif[/img] ($1150, 2 players)
<font color="#cc0000">Hero bets $850</font>, Button calls.

Turn: 8[img]/images/graemlins/club.gif[/img] ($2850, 2 players)


I would apreciate if you could add why you choose a specific action and which range you put him on.