Several people on opencarry.org are saying that the person this happened to should contact an attorney. I agree with that.
Remember, this audio/video is starting to get some exposure. A large number of Philadelphia police will be watching and listening to it. They have access to this persons name and a considerable amount of personal information.
As they say, they know where he lives. He definitely needs to contact an attorney.
There is a second part of audio - link right below the screen for part 1. Listening.
Any chance of going anywhere for this dude ended when he failed to get on his knees as directed. Obey at the time, take it up with someone else yourself, that is, request a supervisor come immediately. That’s what I do.