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A lot of the damage is just random of course but a small bit of story/explanation behind some thingssss While being rented out at some pizzeria/plex/enclosed location, a fire was started and things hit the fan very quick. The fire obviously charred or completely destroyed his fiber parts (mane, tail, wings, etc) exposing the wireframe of his wings along with it.

Rubble and debris that came free began to fall. Sphynx tried to run causing a lot of damage to his legs. At some point debris fell and buried Sphynx- trapping his lower appendages and possibly an arm. Breaking free and clawing his way out of the rubble caused a LOT of damage to his casing- breaking it off if the impact originally didn't.