Maybe you haven’t devised an emergency medical procedure, but you have sat next to people choking on emotions. For that procedure you are well trained. You don’t have to squeeze the air out of their lungs. You don’t have to make some incision. You need simply to look and say, “You seem to be upset.” Don’t add, “Is there anything I can do?”
Simple procedure. Sometimes it works. Doesn’t seem to have any nasty side effects though someone could say, “Mind your own business.” But then, there’s a remedy for that. “Sorry, I was just concerned.”
Maybe the emotional choking will continue, but for a moment you will have stopped it. Right place, right time; or, right place, right brief moment.