Zzzap after bleeding energy

“The fog brightened around them. It wasn’t daylight. More like a full moon had come out from behind the clouds. He looked up and saw the glowing figure above them.
“Whoa.” Madelyn looked up at the wraith. “Are you okay?”
“Maybe. Not sure.” Zzzap’s light was dim, not much more than a hazy glow in the mist.
“How bad are you?” asked St. George. “We can try to get some of our supplies back. Maybe get you a couple sweet potatoes from their—”
Zzzap waved his arm. “I’m past the really hungry phase, he said. I don’t think…I think I shouldn’t change back until we’re somewhere with, y’know, better medical facilities.”
“Yeah?”
“Yeah. I’m…I’m feeling a little light-headed.”
“Do you need to go now?”
“I’ll be okay. Just…don’t ask me to kill any more submarines.”

Excerpt From Ex-Isle, pg 636
Peter Clines
https://books.apple.com/us/book/ex-isle/id989619017