It's too much of a coincidence that during the rallies organized by those supporting the Hong Kong community here, in just about all cases, counter-protesters appear. That would be a very strange pattern. They come at almost the same time and leave at the same time, which raises at least a suspicion, whether or not they are orchestrated by something or someone.
As far as the threat is concerned, I think Canada in recent years has been seeing more and more appearances of threats, even being raised in Markham and Vancouver city halls.