User blog comment:TheCarrotSaysYumYum/FT0 8 - Magnolia is on Fire?/Blue Cat Happy, Review./@comment-24930767-20150220142842/@comment-25111584-20150223084140

We saw that he can dispel Mavis' illusions and manipulate Yury's Crystal Bomb as he wishes. So Dispelling Magic and Telekinesis would be assumed unless something is stated directly.

If the cage is normal, he should just be able to rip it apart with Telekinesis or use the rocks around Mavis to slice her body to bits. This is, of course, if he can use Telekinesis.