If you are with another woman (gf, wife, mother, sister or other) you can wait for the guy to go to the toilets or smoke a cigg or whatever and go to offer your help to the girl, offer to drop her home or to the police station to fill a complain. If you are alone, it's better to ask the restaurant staff to call an officer, explaining them that there is someone threatening a girl and that you are scared for her safety. Stay there until they arrive so you can be a witness of the events. If no such situation happen (you're out and there is no authority figure to help you or no way to talk to the girl alone) then just step in, offer the girl a chance to run away and talk to the man about his behavior and how you're not letting this happen. Whoever hits first is the punishable one so stay calm and just offer her a chance to hide somewhere. Afterwards, if you manage to make him leave, encourage her to fill a police complain in which you can be called as a witness, leaving her your details.

If you get an opportunity to find out what car they came in, take a pic of his license plate, too.

As a female, you can go up to the table, state you're feeling unwell and ask the young lady to help you to the bathroom. Once in there, she can decide if she wants to call a relative or the cops, or simply leave by the staff door.

Well I'm a woman and I have gotten involved more than 2 or 3 times. You just have to.

Showing them both that she is not alone is key. Take pics of the guy and call 911 if you see them ready to leave. Follow them out to his car and take pics of the license plate and let her know she can stay with you until the police or a friend can come get her. If you are a solo male, do not offer her a ride home. Offer to stay with her IN PUBLIC until someone can come get her. Let the guy know you heard him, that you have pics (involve the restaurant, they have his credit/debit card details, and ask them to save a glass he drank from for fingerprints/DNA) and willing to be a witness. Tell him you're not leaving the young lady and he can either walk away or the he can talk to the police when they arrive (whether you've called them already or not). Proof is what these guys think no one has. In the face of numerous witnesses and the police, he will most likely just go home. Defending her or yourself isn't wrong. But let him be the one who puts his hands on you first.

Well, I'm a woman and I have gotten involved more than two or three times.

The fact that you know you could get your a*s beaten proves you're a good man.

That is exactly the point, no? It is not your place; you have not been trained. You could call them in, and should.

If you have a cell phone call the cops yourself. Don’t call through 911. Call the local dispatcher and explain exactly what has been happening. Now if it were me I would call the cops and talk loud enough that the guy could here me while sending my 6’2” tall 300 lb husband over to safely extract the girl and assure that the jerk paid the bill.

Thank God for people like you who at least try!

That man is just what he is badge or no badge- just a decent human being and a father. I bet that even without his badge he'd have gone to that a*****e and scare the hell our of him.

simple....have a spine and a pair that clank when you stand up. I know plenty of females that have gotten involved in situations like this as well without being a peace officer. 90% of the time, you just have to put a little fear into the bullies head to make them cower. The other 10 percent of the time, well, sometimes you have to sock a fool in the jaw to get a point across.

You'll have to get into a physical fight. No shame in that. Fighting is part of life.

As the first guy said: be willing to put the jackass through a wall.

Maybe not just luck...

@Michał Jastrzębski no-one EXPECTED anything. Where'd you get that idea?

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How many times have you stood up for another woman? I can say. ZERO! So, Don't preach :)

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so, you expect to every man put his physical safety (and possible charges too, if things go wrong!) on the line for you , for nothing in return?