It doesn’t matter what it was, to Trump, if only matters what it looks like. How the film plays. The point is, that’s pretty likely what they’re showing Trump, anything that looks like an excuse to send in troops and declare the Insurrection act.
There’s talk that video is being recycled by Trumps security squad, to make their own incited situations look more fierce, difficult, and numerous than they are. It’s probably why they’re throwing tear gas around willy nilly, better footage to nudge Trump closer to the insurrection act.