Kayn's ultimate weird interactions

[INTERACTION] Kayn's R is full of weird interactions. For instance, when you get into Mordekaiser's realm and you R on him, it automaticaly drags you out of it when the realm ends without doing any damage or healing effect. Simply appearing on top o lf him. Also, other champions like Morgana or Nocturne that has a target delah cc don't act the same. Morg's R will drag you out of yours (dealing damage) and Nocturne's E just don't do anything but we see the animation acting normaly. So we never know what's gonna happen if you try to avoid cc with this spell. Can it be the same for every thing and everyone. Especialy tired of wasting my R to try to survive Morde when Kayn's is actualy one of the few counters to that over picked busted champ.