He just gave me his stack!??

[Borax]

Anyone who can explain the play of player CO here?
No read on player before this hand.

0.25/0.5$ NL 10 player

Dealt to Borax in SB

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OpeningBetRound
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Borax : Posts small blind 0.25
BB : Posts big blind 0.50
UTG : Posts 0.50
UTG : Checks
UTG+1 : Folds
UTG+2 : Folds
MP1 : Folds
MP2 : Calls for 0.50
MP3 : Calls for 0.50
CO : Raises for 4.00
Button : Folds
Borax : Raises for 10.00
BB : Folds
UTG : Folds
MP2 : Folds
MP3 : Folds
CO : Calls for 6.25
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Flop

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Borax : Bets 10.00
CO : Calls for 10.00
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Turn

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Borax : Went all-in 40.70
CO : Went all-in 14.20
Borax : Receives returned betting money 26.50
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River

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Showdown
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CO
- One Pair - 2's
Borax
- Two Pair - K's and 2's

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Result
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Borax Showed Cards (Winning) 67.90
CO Showed Cards

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[Khabbi]

That was a super sneaky play he made to call your all-in with nothing. I bet you didn't know what to do next.

[Borax]

Yes, it was hard to decide what to do after his last call.
The guy just sat down and gave me his stack and then left. Maybe he was playing to many tables?

A lot of bad play on this table though. I had lost most of my stack a few hands before with a set against a gutshot straight draw that hit on the river. He held J8 against my 99, flop 9Q2 rainbow and he called me to the river with nothing, hit his river T and called me again...