Antifa were observed to use the scouts on bicycles before. The bottles of piss or "foul smelling liquid" was an idea they picked up monitoring a militia site and saw in one of the threads there convos about doing such to antifa. That was the tip to their presence. That same site, now defunct, had an influx of new members immediately after 8 chan went down. One of those, handle of Renegade Outlaw, spent a great deal of time inciting like one of the shills does here. Same tactics, all about "do something now or you're all pussies" and "all this talk but never anything being done, we need action" …sound familiar?
IIRC it was only presenting itself as MAGA Riots when it started, received warnings from actual militia, then went with Maga Extractions and the "disclaimer" about merely reposting from some dark web site. I understand it had been tracked back via IP to a location but don't recall what that location was. Rough guess right now would be the same Field Office that said 8chan was dangerous and used Snopes as proof
I know blood shows up well under UV light (or is it IR, I'm kinda tired) and the reason vomit shows up green in so many pics is because of the phosphoric acid in human stomachs