This is a seriously fracked-up situation. That being said,
Telling people to not call 911 when someone is in need of medical assistance is irresponsible, regardless of the absurd way that the police and the system treated Partensky.
The better takeaway from this encounter would be to move on when the police tell you to move on. Not because the police know what they're doing, not because they were in the right and Partensky was in the wrong, but because not listening to what they say, promptly and precisely, can admit you in into the system.
His criminal lawyer friend's advice to extract himself from the system was the way to go. Once you're in there, you can say "sir" and "ma'am" all you want--it's not going to get you anywhere.
Having served as "good samaritan" in several first aid situations that required 911, I can tell you that there is a clear moment when the so-called professionals take over. If you're performing CPR and step away before they're ready, they'll tell you to continue. And when they assume control, they let you know that as well.