$100+9 rebuy Hand played by Sheets, I'm Confused

[Zizz]

I was just passively observing so I don't know what any of the history before this hand. Nonetheless I'm confused.
Perhaps sheets could give some analysis.

PokerStars Game #5100297276: Tournament #25455426, $100+$9 Hold'em No Limit - Level V (75/150) - 2006/05/30 - 15:31:07 (ET)
Table '25455426 13' 9-max Seat #8 is the button
Seat 1: mustangc1923 (8928 in chips)
Seat 2: stinky18 (8481 in chips)
Seat 3: thethug (10350 in chips)
Seat 4: thankyou (9635 in chips)
Seat 5: sheets (13740 in chips)
Seat 6: micon (3813 in chips)
Seat 7: polpolpol (10608 in chips)
Seat 8: Opobi43 (17023 in chips)
Seat 9: skjetten (14618 in chips)
skjetten: posts small blind 75
mustangc1923: posts big blind 150
*** HOLE CARDS ***
stinky18: folds
thethug: folds
thankyou: raises 300 to 450
sheets: calls 450
micon: folds
polpolpol: folds
Opobi43: raises 1800 to 2250
skjetten: folds
mustangc1923: folds
thankyou: folds
sheets: calls 1800
*** FLOP *** [7h Ts Kc]
sheets: bets 2850
Opobi43: raises 3750 to 6600
sheets: raises 4890 to 11490 and is all-in
Opobi43: calls 4890
thethug said, "??"
*** TURN *** [7h Ts Kc] [Jd]
*** RIVER *** [7h Ts Kc Jd] [7d]
Opobi43 said, "wtyf"
stinky18 said, "lol"
*** SHOW DOWN ***
sheets: shows [Qd Ad] (a straight, Ten to Ace)
Opobi43: shows [Ah Ks] (two pair, Kings and Sevens)
Opobi43 said, "omg u are the wordt"
sheets collected 28155 from pot

[rockin]

Yeah, looks pretty bad. Maybe it had something to do with reads on his opponent betting with air. He may have had history with this one player before. Maybe he had somewhere to go. Even the good players play badly sometimes too.

[Zizz]

Yea in no way am I trying to be the guy who goes "Aha! Look at this great player play this hand horribly!" But the hand seemed interesting to me and I feel it would have to be a pretty solid read to pull this move off.

[Ansky]

Looks kinda bad, although opobi is like crazy psycho aggro.

[Copernicus]

If this had been posted with anonymous names the universal chorus would have been "What a donkey"

[yabastid]

maybe he had the prop bet with actionjeff?

editied to say: no, i think I'm wrong.

[BPA234]

As usual, you are the man with answers.

[Gomez]

He's thinking at the 5th level.

[Copernicus]

yes, and like the universe, the levels are curved and 5th level overlaps the 0 level.

[dhende3]

[ QUOTE ]
yes, and like the universe, the levels are curved and 5th level overlaps the 0 level.

[/ QUOTE ]

I laughed.