Yeah I'm always hesitant to blame people when it might not be their fault. If you were able to catch that dragoon's name (maybe through battle log or checking after the match), and notice it happen again more than once with the same guy, then it becomes suspicious, otherwise it's probably just some bug. Thx for posting the video at least, a lot of people here start witch hunts and don't even have any proof, at least we have something here to work off of.