Angel Halo = getting drugged + degenerative effects while being drugged
Main purpose: Destroy or alter one's brain causing sleep and making them become like kids. Kagatie said that it would be easier to control earth if they're dealing with kids
Shakti made the Angel Halo go back using her newtype powers but since her desire to stay earth was manifesting, the halo or all its psychickers controlled the rings and sent Shakti back to earth.
As for Katejina: Love makes you do ODD things.