Mildly interesting http://plays.tv/video/5a5b32b753606ed253/huh
Never had that happen before.
https://www.youtube.com/watch?v=7-lL47oV8n4
I've seen it twice before your post - OP, I need you to tell me this: did the Teemo against you have the Omega Squad thing?
In all three occurrences of the bug, there was a Teemo. In the previous two, he had that skin. And Teemo was the only champion in common in the first two games.
Also, completely irrelevant note, was that a Zoe with Press the Attack there?
Oooh, this is super interesting... and odd, haha. Thanks for this note! Definitely a good start on tracking this bug down. :)