My son went to a concert with my wife years ago. At a certain point he grabbed my wife’s arm and told her that they needed to move away. She protested and didn’t want to move, but he insisted. A few seconds later, a fight broke out between a couple of drunk 20 year old guys.
He is a middle school teacher. Head on a swivel all day long.
He's aware AND he's a middle school teacher - - tells me he's brave. And a son worthy... congratulations.
It starts with body language quirks and then come the sounds!
“Head on a swivel all day long.”
That is the key, not just for us to keep an eye out, but to let the n’er-do-wells know someone is watching, just keep moving along.