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Black's defence of his potential territory in the top left corner comes too early, as it loses one move in the Main Semeai.
Please note that White has not yet connected at , what would cost her two Main Semeai Liberties.
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White simply starts with the Main Semeai.
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White does not connect Black's double-atari, and is happy to let him capture her two stones.
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Due to Black's mistake with in the top left corner, White will win the Punishment Semeai.
This means that she will later – when having captured the hanezeki's tail with a move at – not throw-in at after Black recaptured with , but occupy one further liberty of Black's large group in the top right, and eventually capture it.