Looking for someone that could give info of what a black flag on a video represents/says. The black flag appears here at 1:04.

Looking at the video it seems that the police only target the individual carrying the flag. The video a report about the Navalny arrest today.

Didn’t know where to ask here on lemmy , couldn’t find a russian/vexillology communitie here, if this doesnt fit here I will delete it