When Shion rushed back at Ganondorf, he'd find himself facing with a sword Ganon was holding with his free hand. Ganon still hoped the boy has some very basic common sense.

But then he let Reno free, letting go of him before he could be choked to death. As tempting as to seal Reno away in a crystal was, he had better uses. And killing him now would break the spell... All things considered, the spell may wear off pretty soon. Maybe time to put into action a B Plan.

"Do not do that again and keep watch over the boy."