Thresh/Sion interaction bug

Whilst playing around in a custom game, we discovered that if Thresh hooked an ulting Sion and then reactivated, not only would Thresh fly across the map, but afterwards he would become uncontrollable. No matter what my friend did afterwards, Thresh would just follow Sion around the map, auto attacking him (kind of like a bot). It was funny to watch Thresh become Sion's pet, but I guess it wouldn't be too funny in a real game.
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