Unless a child, an elderly person or an animal is in imminent danger, I will not interject myself into a fight ... I'll call the police and give them pertinent information so they can respond though.

You aren't being silly and you did nothing wrong ... Even the police hate responding to fights (especially if its domestic violence) because often the combatants turn on them.

Nevertheless, they are trained professionals and can get as much back up as is necessary to settle the situation. You and I would probably end up just being somebody else the combatants would beat up on.

I don't know about you, but I'm just not into getting beat up on.