He can't do that. Harassing Kuai is written in his evil person contract.

"The heat is making you more dense than normal, Kuai. My reasons are of no concern to you." More that it'll make Kuai even more obnoxious than he already is. So much false hope, though at the moment he didn't seem to have much of that due to the heat.

"I wonder how long you'll be able to endure this weather. Maybe I'll stick around to watch your slow demise."