[psandman]

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Situation #2 is why I like the rule (in tournaments) that if you're not seated when the button gets his second card, your hand is dead. Done. Easy.

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This rule is generally not applied when the floor says "deal in the big blind, I am bringing you a player"

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According to OP the Floor was not involved in this . . . The Player had "started to sit down" .

The Player was not the Big Blind.

Those two factors make this a different situation than when the floor comes over and says "deal in the big blind, I am bringing you a player"