Cairax harming Zzzap, recovers from touching him

Zzzap steeled himself for the wave of nausea that always came when he touched solid matter in his energy form. He dipped a little lower in the air. Cairax Murrain’s talons lashed out and ripped through his side.
The claws passed through Zzzap and left the gleaming wraith shuddering in the air. It wasn’t just the churning stomach he usually felt. It hurt. A lot. He let out a cry like a hiss of steam and static. The pain left him dizzy and lightheaded and cold. Guts open to the air cold, if he had to guess. He glanced down at his hands and saw his fingers blur into a thick shape at the end of his arm.
The demon raised its talons. The skin was charred and smoking, but the fingers flexed without effort. They filled out and healed as it studied them.

Excerpt From Ex-Communication, pg 429-530
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546