So what is it you're supposed to do against red smite bruiser Yi?
This guy comes at you like Usain Bolt and there's no one who can stop him diving your back line and assassinating them when he's ahead just by a bit. Red Smite reduces all damage he'll take from a target of his choice, and his on hit bruiser build gives him massive survivablility where he would normally explode and be forced to be cleanup crew on say an AD build. Hard CC just stopped working against him after a certain point and he just shrugs it off and keeps going.