DSDP Don wrote:
Most police officers will tell you that they are taught that when they're off duty and especially with their family, never get involved unless absolutely necessary. Your only involvement should be to make a phone call to local law enforcement and be a good witness. This is what everyone here should do when confronted with these types of situations.
That ^^^^ is by far the best answer here, especially the WITNESS part. A quick photo with your cell if done discreetly would be helpful as well. Stay out of harm's way whenever possible......Dennis