I just made an arena attack which came down to a standoff of Sulley vs. Tia.
Each time my Sulley (Woody Disk) performed Healing Laughter, the enemy Tia also healed.
She wasn’t charmed as everyone else had died, and she continued to attack my Sulley. It’s possible she was charmed by Nick earlier on, I didn’t notice.
My team: Sully, Quorra, Tia, Nick, Jack Jack
Enemy team: Baymax, Quorra, Walle, Tia, Calhoun