Hades stared at him with wide eyes.

"Just go get some tissue paper, for Heaven's sake. If you cauterize my genitals clean off, I'll do the same to you in turn!" Hades did not trust this.

"Or at least tell me the aim and basis of your healing concept before you use it on me!" Can't you see that he's just a frightened animal right now? He doesn't want the pain of a dick injury, but neither does he want to suffer a worse fate.