Like I said, I don't know. There's so much chaos in the scrum that I cannot even begin telling if it was an accident or if Tkachuk jumped himself. The results are damning, but the circumstances just prior to it are kinda inconclusive. I've watched it a dozen times at slower speeds and I still don't fully get what's going on before he lands on Campbell. There seems to be quite a few different conclusions and many tiny details mentioned by other posters too.
As you guys said, it's kinda unnatural if it's unintentional. But to me it doesn't completely seem like a natural movement to jump that way either as an intentional move.
It's fair if you guys think if it's intentional, as a Flames fan, it's more of a prayer that it wasn't intentional.