Interesting Hand from WPT Aruba

[Dynasty]

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Then MP1 did the unthinkable. He flipped over Ace-Jack not-suited. I lost leaving me crippled.
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I played at the table for another 90 minutes, and even after all that time, my read on MP1 didn't change. He was definately loose passive, and almost definately an internet qualifier. I am still in disbelief as to how he of all people could put in his entire stack with AJo.

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You're not making yourself clear here. If he's definitley loose-passive, isn't that the kind of player you expect to call a big all-in raise? This seems especially true in situations where he's put some money into the pot first and then raised behind him.