Microstakes but still interesting...did I read this wrong?

Had just sat down at the table so had no read. I thought he was chasing and then overbet to cover himself. If he had a pocket pair I had it covered but then to be not only calling but raising with a draw? I was stunned.

***** Hand History for Game 6866740133 *****
$5 USD NL Texas Hold'em - Tuesday, March 11, 19:33:04 ET 2008
Table Beginners #1304073 (Real Money)
Seat 6 is the button
Total number of players : 10
Seat 2: niclotus ( $2.84 USD )
Seat 3: conquarer73 ( $6.13 USD )
Seat 4: amazonka777 ( $5.84 USD )
Seat 6: scullez ( $1.75 USD )
Seat 7: Watermelon69 ( $8.58 USD )
Seat 8: snaipeur ( $5.21 USD )
Seat 9: dimmert ( $2.05 USD )
Seat 10: symark ( $3.16 USD )
Seat 1: ponyfitness ( $4.96 USD )
Seat 5: Oret3 ( $0 USD )
Watermelon69 posts small blind [$0.02 USD].
snaipeur posts big blind [$0.04 USD].
** Dealing down cards **
Dealt to ponyfitness [ 8s 8h ]
Oret3 has joined the table.
dimmert folds.
symark calls [$0.04 USD]
ponyfitness calls [$0.04 USD]
niclotus folds.
conquarer73 calls [$0.04 USD]
amazonka777 folds.
scullez folds.
Watermelon69 calls [$0.02 USD]
snaipeur checks.
** Dealing Flop ** [ 5h, 7h, 6d ]
Watermelon69 checks.
snaipeur checks.
symark checks.
ponyfitness bets [$0.16 USD]
conquarer73 raises [$0.32 USD]
Watermelon69 folds.
snaipeur calls [$0.32 USD]
symark folds.
ponyfitness calls [$0.16 USD]
** Dealing Turn ** [ 4h ]
snaipeur checks.
ponyfitness bets [$0.20 USD]
conquarer73 raises [$0.40 USD]
snaipeur folds.
ponyfitness calls [$0.20 USD]
** Dealing River ** [ Ac ]
ponyfitness checks.
conquarer73 bets [$2 USD]
ponyfitness calls [$2 USD]
conquarer73 shows [ Th, 6h ]a flush, Ten high.
ponyfitness doesn't show [ 8s, 8h ]a straight Four to Eight.
conquarer73 wins $5.67 USD from the main pot with a flush, Ten high.
#Game No : 6866746365

With the way he played the flop I put in on either on the nut flush draw or a PP as well. I think you read the hand ok, and played pretty good on the flop. However my feeling is when you bet .20 on the turn and he min raises you fold. I may be over thinking this but I see this a lot at the $5NL level. When people get on flush draws or open enders they play pretty agg. Thats my take on this hand.

Funny thing is I never even considered a flush. I put him on a high pocket pair or even 66/77 trying to draw to a full house. And then when he overbet the river I assumed he was trying to buy it.

After that hand I watched for about 50 and he was a very aggressive player, buying lots of pots by overbetting smaller stacks and raising with pretty much anything. Problem with players like that is that they are so unpredictable.