Zangetsu, as intimately close to Gon and Gon's body as he is, can feel that burning on Gon's soul. Nope. It's gotten way too dangerous -- and if Gongenzaka's soul is burned away, there will be no saving him.

A grey, eyeless, blunt-toothed worm will appear before Gon in the spiritual space, and it speaks in Zangetsu's voice.

"Time to wake up."

The worm doesn't give Gon a chance to respond -- it swallows him whole, and Gon will find himself back in control of his body with Zangetsu, once again physical, on his back.

"I ain't lettin' you die, idiot."

He jumps off and surrounds himself in his own energy, hoping to cut the miasma of death, even if it's just a bit.