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The user loses HP equal to 1/4 of the damage dealt to the opponent, rounded down. If the user knocks itself out and the opponent's Pokémon survives, then the opponent's Pokémon will not attack during the same turn. The Pokémon will not lose 1 PP for the attack it was about to use. The effects of poison, burn, Leech Seed, and Perish Song will be ignored on that turn. The effects of attached items will trigger.