10NL: I has the confused

I'm like 20 hands with this guy so no real reads. I thought I had a range for him, but unless he's sitting on 33, I'm not sure what the flat/flat/donk line is supposed to represent on this board. I call it mostly 'cause I'm confused and I'm sitting on a weak TPGK kinda hand. No way I'm calling when the Q completes some str8 and more 2pr type hands.

I'm not questioning the fold... I'm just not sure what he has? Range?

Full Tilt No-Limit Hold'em, $0.10 BB (6 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

UTG ($10)
MP ($16.84)
CO ($9.60)
Hero (Button) ($10)
SB ($10.05)
BB ($10.15)

Preflop: Hero is Button with J, 10
3 folds, Hero bets $0.35, SB calls $0.30, 1 fold

Flop: ($0.80) 9, J, 4 (2 players)
SB checks, Hero bets $0.55, SB calls $0.55

Turn: ($1.90) 3 (2 players)
SB bets $1.30, Hero calls $1.30

River: ($4.50) Q (2 players)
SB bets $2.70, Hero folds

Total pot: $4.50 | Rake: $0.30

I think this is completely reasonable
also, hands like AJ are possible, turned flush draws, turned oesds, weirdly played flopped sets
that's why I think turn is a call he could have random shit
but he's pretty determined about it on the river so I'd take a look at his PF stats for the first 20 hands and if he looks aggressive PF I'd tend to look him up more
but seeing as this is NL10 folding is not a huge leak, people generally don't continue bluffing for two streets because they are huge pussies