I wish I knew enough about Stud to know if this is a bad beat, bad play, or standard. So I'll post it here and take a look. Big props to Triple-T for the converter!!

First hand (final 3 of SnG):
PokerStars Stud HandHistory converter by triple-t
PokerStars Game #6090617110: Tournament #30861200, $3.00+$0.40 HORSE (7 Card Stud Hi/Lo Limit) - Level X (400/800) - 2006/08/28 - 23:55:04 (ET)
Table '30861200 1' 8-max

Seat 2: S2 (6970 in chips)
Seat 7: S7 (1896 in chips)
Seat 8: Hero (3134 in chips)
<<< 3rd Street (3 players) >>>

Dealt to S2
Dealt to S7
Dealt to Hero
S7: brings-in low 120, Hero: calls 120, S2: folds
<<< 4th Street (2 players) >>>

Dealt to S7
Dealt to Hero
S7: checks , Hero: bets 400, S7: calls 400
<<< 5th Street (2 players) >>>

Dealt to S7
Dealt to Hero
S7: checks , Hero: bets 800, S7: calls 800
<<< 6th Street (2 players) >>>

Dealt to S7
Dealt to Hero
S7: checks , Hero: bets 800, S7: calls 496 and is all-in
<<< River (2 players) >>>

Dealt to Hero

Results in white below
*** SHOW DOWN ***
S7: shows [7c 6s 2c Qc 8s JavaScript 8h] (HI: a pair of Eights)
Hero: shows [3c 4s 5d 3d 7s 9s Qh] (HI: a pair of Threes)
S7 collected 3872 from pot
No low hand qualified

Second hand. Same villain.

PokerStars Stud HandHistory converter by triple-t
PokerStars Game #6090661564: Tournament #30861200, $3.00+$0.40 HORSE (7 Card Stud Hi/Lo Limit) - Level X (400/800) - 2006/08/28 - 23:58:38 (ET)
Table '30861200 1' 8-max

Seat 2: S2 (5852 in chips)
Seat 7: S7 (4192 in chips)
Seat 8: Hero (1956 in chips)
<<< 3rd Street (3 players) >>>

Dealt to S2
Dealt to S7
Dealt to Hero
S7: brings-in low 120, Hero: calls 120, S2: folds
<<< 4th Street (2 players) >>>

Dealt to S7
Dealt to Hero
Hero: checks , S7: checks
<<< 5th Street (2 players) >>>

Dealt to S7
Dealt to Hero
S7: bets 800, Hero: raises 800 to 1600, S7: calls 800
<<< 6th Street (2 players) >>>

Dealt to S7
Dealt to Hero
Hero: bets 156 and is all-in, S7: calls 156
<<< River (2 players) >>>

Dealt to Hero

Results in white below
*** SHOW DOWN ***
S7: shows [6h 4d 3h Ad 3s 6s 5s] (HI: two pair, Sixes and Threes; LO: 6,5,4,3,A)
Hero: shows [4h 5d Ac Ts 2d Td Kh] (HI: a pair of Tens)
S7 collected 1996 from pot
S7 collected 1996 from pot

Other than raising both hands on 3, I would have played them the exact same way. You are 3 handed and normally aggression wins. You just got unlucky catching two bad cards on the end of each hand while he was catching perfect cards on his.

1st hand
Raise 3rd and I think you end it there. Never slowplay 3rd or 4th in a Stud game. EDIT: AHHHHHH! He had the bring in?!!!!

2nd hand:
In a tourney setting... with 2.5 bets... Stud8...

I see A45, I'm raising the hell out of it. In hindsight, it's weird that S7 didn't complete because we know what he had, but you have to complete and raise-raise-raise. No checking and no calling because he's betting and you're not folding.

OK, I just figured out the probabilities on the first hand going to the river:
54% of the time I will win the entire pot.
32% of the time we split
13% of the time he wins the entire pot.

I'm ruling that it was a bad beat.

Second hand:
Going to the river he was a favorite:
38% he wins
32% I win
30% we split

I was unlucky, but I can't blame him for staying in the hand. Big money went in the pot on 5th street (noone's folding after that). He had lo draw of A,3,4,6 and a pair. I had better low draw of A,2,4,5.

The first was definitely a bad beat, but with only 1900 in chips, I don't think he's fighting for half the antes and bring in with 3 to a lo if you complete 3rd St. Second hand, I think you're showing down and he isn't going anywhere. I still test the waters by completing 3rd St. You could've gotten away on 5th- especially with the dead 3's. I'm curious as to why he didn't bet 4th.