you may be right about that. His intentions aren't clear. He was either there to aid in the creation of this agitprop or to defend a fellow Trump supporter. He definitely injected himself into the situation and positioned himself to be able to spray her. He first enters the scene
here at 1:20. At 1:37 he appears to be checking the pepper spray device to ensure it is ready to deploy. at 2:06 there is zero hesitation on his part as he deploys the pepper spray. He's still hanging around the scene at 3:01 well after the police have marched through. Not sure what that might suggest.
At 1:37 he appears to be checking the pepper spray device to ensure it is ready to deploy.Good catch, I missed that. It would fit an Alinsky template for one person to start a confrontation, a second person to try to make sure the first looked like a victim and a third to document it.