Zzzap “not holding back”

“Do you think your pale heat is anything compared to the fires of the Abyss?”
“Apparently not,” said the gleaming wraith. “So I guess there’s no reason to hold back.”
He threw both palms forward and the night turned to high noon.
The blast washed over the demon like a tidal wave. The pavement around it turned to liquid tar and boiled away. A manhole cover melted to slag. So did a nearby car.
Freedom threw his arms across his face. So did Madelyn. St. George clenched his eyes shut and felt the heat of a sunburn on his face. Even Stealth and Max paused.
The world turned white as light and heat poured out of Zzzap. The paint on the buildings caught fire, and then the concrete itself. The air roared. A dozen nearby exes charred and collapsed into dust that was whipped away by superheated winds.
When it was over the wraith sagged in the sky for a moment. His brightness faded. Then he seemed to take a deep breath and straighten up in the sky.

Excerpt From Ex-Communication, pg 535-536
Peter Clines
https://books.apple.com/us/book/ex-communication/id635706546