Kayn R bug - Used it twice in a row one after another

I just played a game against a Kayn that ulted one of our team mates, then after it finished and he came out he immediately used it again. Is that a bug? Video: https://www.youtube.com/watch?v=5YSddAaFxk4&feature=youtu.be

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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