Corvus glaive immunity buff question

Shouldnt corvus's glaive immunity buff come back up after mephistos soul imprisonment expires after 15 seconds? The glaive charges are still present and not used up, so after 15 seconds its just the glaive charges without the immunity buff without which the crits are low and hits dont ignore opponents armor.
However the ice armor of ice man comes up after the 15 seconds of soul imprisonment, so shouldnt corvus's buff also come up in the same way? Is this normal behavior?
However the ice armor of ice man comes up after the 15 seconds of soul imprisonment, so shouldnt corvus's buff also come up in the same way? Is this normal behavior?
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I guess thats the catch here to get knocked down purposefully and then wait it to come back up. Would have loved to test it but just now finished the last path.
P.S. First!!!! And by 11 minutes. LoL.