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This happen to me 3 times over the weekend. Why fighting shyvana with riven is I'm in the middle of my combo skill and she uses her dragon ultimate over me it makes riven froze in place until she dies. Basically makes riven where she can not move and grays out all her skills so you can not use them. She does still auto attack but that is all she can do. Aafter riven dies and respawns everything is back to normal.
Again this happen 3 times over weekend so I know there has to be a bug more than it just being fluke.