Iceman Coldsnap vs Glaive Immunity

Im in AW and get to an iceman, Its also the Start of the fight so my Glaive Charges are Full and his coldsnap just destroyed my 4/55 Corvus. Im confused and also really upset that my Corvus (Who is supposed to be immune while Glaive is active) just gets Wrecked....Fix This Please.
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