@futurebird@sauropods.win
"Am I free to leave?" will mark you out as an "annoying do-gooder who doesn't like police"
But this could be an improvement on seeming like someone they could trick or trip up more easily.
Prepare to be ignored. Police will try to provoke you so they can arrest you or stop you from filming. Police will hit you unprovoked or try to knock your phone away.
Don't waste time "reasoning" with them. Just get the video so more people can see what they are doing.
@futurebird@sauropods.win
Practice how you will film and what you will say. It will be a very stressful situation and it's tempting to just try to "be reasonable and talk" you aren't dealing with someone who is reasonable. They want you to stop filming. They may be very angry and emotional and lash out without warning.
This can be shocking if you have watch too many TV cop dramas.
You are our eyes and ears. The things you film could vanish forever so don't get drawn in to a back and forth.