Choco chip Starfish munched on Pancil Urchin and pulled off spines. What do I do? Please Help!!!!?

I have a Chocolate Chip Starfish and Pancil Urchin in the same tank. I came home today to find my starfish on top of my urchin and the starfish's stomach was out. I pulled him off my urchin and discovered that several spines were missing from my urchin. What do I do? Will the Urchin be ok?