Frost Guardian interaction with the Frog Charm

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My leader that I won a round with had the Frog Charm on (giving them Fury 4), and this has a weird interaction entering the second phase. They were alone in the row when I killed them, and when they entered the Frost Guardian phase, they retained that attack boost, making the fight significantly harder.

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It also may be possible that this could apply to leaders with fury as a base ability, but I'm not sure