Unexpected fold

Poker Stars
No Limit Holdem Ring game
Blinds: $0.10/$0.25
5 players
Converter

Stack sizes:
UTG: $24.65
Hero: $33.15
Button: $26.80
SB: $23
BB: $7.85

Pre-flop: (5 players) Hero is CO with K:diamond: A:spade:
UTG raises to $1, Hero raises to $3.25, 3 folds, UTG calls.

Flop: 2:spade: 9:spade: A:club: ($6.85, 2 players)
UTG checks, Hero bets $5, UTG raises to $15, Hero raises all-in $29.9, UTG folds.
Uncalled bets: $14.9 returned to Hero.

Results:
Final pot: $36.85


I didn't really expect villain to fold here with $7 left..... but I still think pushing was the correct play. Thoughts?

Pushing is def. the correct play. As you said it's an "unexpected fold". Not many people fold 2 cards there.

You just caught someone making an inspired bluff. Probably a mediumish pocket pair or maybe KQ.