This is one instance. Me and a ally were attacking him and we were in his base, thresh used his E, shen stopped auto attacking and using any abilities. Didnt move or even flinch. also he froze at another instance on trying to use his ult to save a bot ally, who we killed before he could get down to save him.
Again no moves or auto atack or anything. i will download lol recorder and post link here next time this happens so as you can better understand the full instance of this happening.