Before Cernd does anything, cast inspect spells on her first!! As she runs around panic and can't cast any spell, immediately summon fire elementals to keep her "more" busy, then summon mountain bears. Just sit back and enjoy the show.
P.S. she will try to attack you, just surround her with about 3 critters and if you come too close, shapechange into Greater Werewolf.....it might be a bit overkill, oh well.
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Long live H22A1!!!!!