First, in HU, the small blind is button and first to act before the flop, last to act after flop.

Second, although it can be frowned upon, your hand is not dead if a card (or 2) is exposed as long is there are only 2 people left in the hand. Since it's head's up, there obv was no more than 2. That said, different tourneys can have different rules, and I'll bet Phil knew the rules for that tourney.

Not sure why Phil would have done this though... can't imagine how it helped him

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