Hand 2: fold when re-raised on the flop. If you call, lead out on the turn.... your check was too weak...this is how I bluffed someone on the same situation:

PokerStars Game #2212517356: Tournament #10635618, Hold'em No Limit - Level VI (100/200) - 2005/07/29 - 00:48:53 (ET)
Table '10635618 1' Seat #1 is the button
Seat 1: puckstopper1 (3325 in chips)
Seat 2: wishingheart (6375 in chips)
Seat 6: bencathers (3800 in chips)
wishingheart: posts small blind 100
bencathers: posts big blind 200
*** HOLE CARDS ***
Dealt to bencathers [Ad 4d]
puckstopper1: raises 200 to 400
wishingheart: folds
bencathers: calls 200
*** FLOP *** [Th Qc Qd]
bencathers: checks
puckstopper1: bets 200
bencathers: raises 600 to 800
puckstopper1: calls 600
*** TURN *** [Th Qc Qd] [3c]
bencathers: bets 800
puckstopper1: folds
bencathers collected 2500 from pot
bencathers: shows [Ad 4d] (a pair of Queens)
*** SUMMARY ***
Total pot 2500 | Rake 0
Board [Th Qc Qd 3c]
Seat 1: puckstopper1 (button) folded on the Turn
Seat 2: wishingheart (small blind) folded before Flop
Seat 6: bencathers (big blind) collected (2500)

the guy immediately tilted a few hands later and it became a heads up match:

PokerStars Game #2212532430: Tournament #10635618, Hold'em No Limit - Level VI (100/200) - 2005/07/29 - 00:50:49 (ET)
Table '10635618 1' Seat #2 is the button
Seat 1: puckstopper1 (1825 in chips)
Seat 2: wishingheart (6375 in chips)
Seat 6: bencathers (5300 in chips)
bencathers: posts small blind 100
puckstopper1: posts big blind 200
*** HOLE CARDS ***
Dealt to bencathers [Qs Jd]
wishingheart: calls 200
bencathers: calls 100
puckstopper1: checks
*** FLOP *** [4s 5h Qd]
bencathers: bets 200
puckstopper1: calls 200
wishingheart: calls 200
*** TURN *** [4s 5h Qd] [9s]
bencathers: bets 200
puckstopper1: raises 200 to 400
wishingheart: folds
bencathers: raises 4500 to 4900 and is all-in
puckstopper1: calls 1025 and is all-in
*** RIVER *** [4s 5h Qd 9s] [8d]
*** SHOW DOWN ***
bencathers: shows [Qs Jd] (a pair of Queens)
puckstopper1: shows [8s Ah] (a pair of Eights)
bencathers collected 4050 from pot
bencathers said, "gg"
*** SUMMARY ***
Total pot 4050 | Rake 0
Board [4s 5h Qd 9s 8d]
Seat 1: puckstopper1 (big blind) showed [8s Ah] and lost with a pair of Eights
Seat 2: wishingheart (button) folded on the Turn
Seat 6: bencathers (small blind) showed [Qs Jd] and won (4050) with a pair of Queens