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Problem: I am not sure the specific order but I think Urgot's ult landed 1st on the enemy champion, then I cocooned the enemy champion. I am sure Urgot's ult completed while the enemy was cocooned though. Urgot and the champion swapped places. Urgot was in the cocoon (urgot was on my team) and stunned now.
Expected: The cocoon stays with the champion(as with other effects on the champion).