[Rejuvenation]

Spoiler for 77:

Hmm I'm taking it that Kujira is using the ice to close her wounds and keeping some of the others from opening? Well just a shot in the dark.

I guess Kumagawa told Shibuki she could let her Minus go full power and she started effecting everything around her before Kujira used her ice to stop her completely.

Also I'm not sure but did she just freezer burn her at the end? Haha that would be hilarious but either way the ice abnormality suits Kujira well.