Cho'Gath Ult Minor Nerf Idea

I know Cho is pretty strong right now and I understand that is going to be addressed. Depending on the severity of the upcoming nerfs, this change I'm about to suggest may be unnecessary. Anyways, the idea is to reduce Cho'Gath's ult damage by half to champions, but if a champion has low enough hp for the original ult to kill them, then it will execute them. This nerf would prevent Cho'Gath from using his ult to chunk you before he dies.