David Coles explains how these three got to their group in his interview with CTV.

Coles version and others there and on the main road conflicts with the version of the SQ, which is not surprising.

That’s great you have video - the more people that can check their pictures and make them public the better.
At some point these officers went into the crowd.
When?
Why this section? 
How did they get to or chose this side street? 
What was their goal with this group? 

(Coles version holds up, but the more voices the better)
Their behavior tells it’s own story, but I doubt it’s the complete one.
Protesters are not a monolithic group, the police either.
The SQ  lied, lied again, and that does not serve the public or the police.
The more people that were in Montebello speaking up, the better for everyone.

Have you considered sharing your video with The Council of Canadians, your MP, police, The CEP the public? The more technically skilled people able to view it the better for everyone.

It’s stories reported like this that make me nuts.
What happened? 
Who roughed him up?
What private company?
Where charges laid if equipment was broken and people hurt? When there is no detail, no follow up you wind up wondering if this is another lie.
Someone had to see this.  Did media get handed a press release and report verbatum? 

CBC

“An attempt to broadcast images of protesters into the site of a North American leaders’ summit ended on a grim note Monday when the cameraman taping the event was assaulted, summit organizers said.

“He was roughed up pretty badly, but his injuries weren’t bad enough to require a hospital visit,” a spokesman said. “As a result, the camera crew won’t be coming back. It’s unfortunate that the protesters chose to express their views through violence.”

Interestingly, the spot where the video in question was taken was nowhere near where most of the action was. If I remember my landmarks correctly, this all happened on the side street adjacent to the cemetery - a good city block from the front gates of the resort.

In other words, they would have had to walk a fair ways to get from where the ‘extremists’ would have been to where the ‘peaceful protesters’ confronted them.

The SQ are making it sound like these guys just turned around and were confronted. It is extremely unlikely that this was the case.