"You... you DUMBASS!" Kat choked out. "How DARE you think you could use my own magic against me... against mEEEE.... against meeehaw! Eeehaw! EEEEEhaw!"
Kat's sputtered protests turned into the brays of a common donkey as her own magic was redirected back to her. Her hands flew to her mouth. "OW!" she cried, as her hands, which were becoming hooves, hit her face sooner than expected. And why would they not? It was growing outward as her nose and mouth pushed out to become more of a muzzle.
As Kat turned her head back and forth to look at her hands-turned-hooves, she could feel something else - the wobble of ears grown longer and hairier.
"Oh, NOOOO!" she moaned. "Not on my birthday! Not before everyone! PLEASE don't! MercEEHAW! Eehaw!"
Dan smiled, although it was a cold smile. "Asking for mercy, dear sister? Maybe you need a little time to think about the proper use of your powers. For that matter," he added, "perhaps you should have some company for that." He raised his arms and held them out in front of him. "You all thought that it would be fine for Kat to wield her control over my life. Perhaps you all should experience the feeling of when that happens."
He swung his arms out expansively, and there was another brilliant blue glow which enveloped the crowd.
As Kat continued to change into a donkey, everyone else in the room started to show signs that they would be joining her soon.