You're seriously going to fight a pregnant woman?

More work stories from this week.
A lot has happened this past week at work. So here is a brief run down of one of them.
On Wednesday Night, March 20th, we had group of five people on the lanes. They were the only customers in the store. The lanes turn off at 1;35am. And once the lanes were off, this group decided they were going to throw 5 bowling balls down the lanes at once. The girl working bowling, let's call her A, told them that they can't and shouldn't do that, as it'll break the lanes.
"We paid for this shit," one of the guys in the groups spat back.
A replied with a shrug and some comment.
One of the girls didn't like this as she said, "Don't talk to my N-word like that."
A wasn't having this. "I'll talk to you and your N-word however I want," she informed them. A is several months pregnant and not in a good mood to deal with a rude group of assholes.
This set the girl and probably the group off, because the girl got in A's face.
All I heard over the walking was A, "Can someone come get this people off my lanes."
I heard my Department Manager ask if A was still on the lanes.
I was at the bar cleaning the last of my dishes and saw the group near the stairs of the lanes.
According to A, while the woman kept yelling in her face. A was like, go a head and do something.
But the woman never did, but when the security guard got there, she started acting like she started talking bigger.
All I know is when I looked up, I saw the one security guard, my amusement lead Ryan, and my Department Manager walk over.
I saw one of the guys, dressed in all black, go to rush A. The security guard and Ryan got in between them. The girls had walked a few feet away,they were still talking big. I couldn't hear them from where I was located. But I know A gave a retort as they were escorted out of the store by my Department Manager.
I later heard the security guard ask my Department Manager if they left the store a few minutes later. She replied with yes.
A was upset and angry about the incident for the rest of the night. She was the baby was squirming a ton afterwards. But at the very least, we were all able to leave at 2:30am. I normally don't get off until 3am.
But I still can't believe it. They wanted to fight a pregnant woman because the lanes turned off when they're supposed to. They were informed before hand that the lanes turn off at 1:35am. That's why at midnight we only sale one game. But it was completely ridiculous. And to that group of five people, I may not remember faces well, but I know two of you came to my counter that night. So if you ever come to my bar for something, I am going to make sure your drink is mainly foam for your shenanigans and make it look like a mistake. We deal with enough BS,  and I'm not about to put up with yours.