stud high

I'm a little lost here. He called a 3rd street raise, and a 4th street bet, so I figured he had trips or 2 pair on 4th. Maybe I should have folded there. He checks 5th, but maybe he was going for a check-raise. Anybody play this differently? Fold 4th?

7 Card Stud High ($2/$4), Ante $0.25, Bring-In $1 (hand converter (use internet explorer))

3rd Street - (1.00 SB)

Seat 1: xx xx 5[img]/images/graemlins/diamond.gif[/img] ___folds
Seat 2: xx xx 9[img]/images/graemlins/heart.gif[/img] ___folds
Seat 3: xx xx Q[img]/images/graemlins/diamond.gif[/img] ___folds
Seat 4: xx xx 5[img]/images/graemlins/spade.gif[/img] ___folds
Seat 5: xx xx 4[img]/images/graemlins/heart.gif[/img] ___folds
Seat 6: xx xx 2[img]/images/graemlins/spade.gif[/img] ___brings-in ___calls
Seat 7: xx xx 7[img]/images/graemlins/diamond.gif[/img] ___folds
Hero: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] ___raises

4th Street - (3.00 SB)

Seat 6: xx xx 2[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] ___checks ___calls
Hero: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] ___bets

5th Street - (3.50 BB)

Seat 6: xx xx 2[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/club.gif[/img] ___checks
Hero: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] ___checks

6th Street - (3.50 BB)

Seat 6: xx xx 2[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/spade.gif[/img] ___bets
Hero: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] ___folds

Total pot: (3.50 BB)

Results:
Total pot $14 | Rake $0