It's entirely possible for frames to be dropped without the clock being obviously affected. You don't need to drop very many of them. Given the way slow mo works, it's definitely that some frames will have been lost in this video. Whether deliberate or not (to be honest, I don't think it is...
The angle of that video is really misleading, as is the way it's been slowed down. There's other angles of the incident that show that VVD did, in fact, end up kicking Lamela. In that particular slow mo, whether deliberate or accidental, it looks like the key frames from the real-time feed are...