Weird folds in stud8

[roggles]

I played an $8/16 table of stud8 where I felt several of my opponents played a very strange game, making folds at late stages in hands where I feel a fold is pretty stupid. So I'm going to ask you what you think of these folds in a couple of hands, and what you think they have. Are they sharks that understand this game at a higher level than me, or are they some kind of weak fish?

Hand 1: What is happening here???

7 Card Stud High-Low ($8/$16), Ante $1,50, Bring-In $2 (converter)

3rd Street - (1.50 SB)

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

4th Street - (3.50 SB)

Seat 1: xx xx 4[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img]___raises
Seat 7: xx xx 4[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/heart.gif[/img]___bets___calls

5th Street - (3.75 BB)

Seat 1: xx xx 4[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img]___raises
Seat 7: xx xx 4[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/diamond.gif[/img]___bets___calls

6th Street - (7.75 BB)

Seat 1: xx xx 4[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/diamond.gif[/img]___folds
Seat 7: xx xx 4[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img]___bets

Total pot: (7.75 BB - $124)

Hand 2: Here??

7 Card Stud High-Low ($8/$16), Ante $1,50, Bring-In $2 (converter)

3rd Street - (1.31 SB)

Seat 2: xx xx 8[img]/images/graemlins/diamond.gif[/img]___folds
Seat 3: xx xx 9[img]/images/graemlins/diamond.gif[/img]___calls
Seat 4: xx xx 6[img]/images/graemlins/diamond.gif[/img]___brings-in___folds
Seat 5: xx xx T[img]/images/graemlins/club.gif[/img]___folds
Seat 6: xx xx 7[img]/images/graemlins/spade.gif[/img]___folds
Seat 7: xx xx 6[img]/images/graemlins/spade.gif[/img]___calls___calls
Hero: A[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img]___completes

4th Street - (4.56 SB)

Seat 3: xx xx 9[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/spade.gif[/img]___calls
Seat 7: xx xx 6[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/club.gif[/img]___calls
Hero: A[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img]___bets

5th Street - (3.78 BB)

Seat 3: xx xx 9[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/spade.gif[/img]___calls
Seat 7: xx xx 6[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img]___calls
Hero: A[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img]___bets

6th Street - (6.78 BB)

Seat 3: xx xx 9[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/heart.gif[/img]___folds
Seat 7: xx xx 6[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img]___folds
Hero: A[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/spade.gif[/img]___bets

Total pot: (6.78 BB - $108,50)