I saw something similar but more troubling the other day when I went to the grocery store. I pulled in the parking lot and saw a lady sitting on the ground between two cars, the drivers door on one was opened. I saw a couple of people who obviously saw her in distress, just walk by and say or do nothing. They just walked by. I had sort of a hard time believing what I was seeing.
I got out of my truck and walked over and said something stupid like "are you ok", while she was struggling to get her balance to even sit up. She looked up at me and said I have a broken foot, and I saw a cast on her foot. I also noticed it looked like she had wet her pants. I looked at her eyes and they seemed clear but I had the feeling something else was wrong. I didn't know if she had just had a seizure or was drinking or on drugs or what. (I suspect the doctors gave her some good painkillers when she broke her foot) I asked her if she wanted to get up and she said yes, so she held out her arms and I got behind her and lifted her to her feet. She was strong enough to support herself with her arms as I lifted her. I was glad of that since she was tall, thin and had big boobs. I didn't want anyone to think I was some perv trying to cop a feel of the hot drunk chick. I know, I think of some of some strange stuff at the weirdest moments sometimes.
When I got her back standing she had to lean on the car to keep her balance. I knew something was wrong with her but didn't know what, and didn't ask. I did suggest she get in the back seat since I didn't think she was in any condition to drive but she said she would sit in the divers seat, that she was waiting on someone shopping in the store. I did not feel totally comfortable putting her in the drivers seat but I felt better about it since she told me someone in the store would be coming out soon to take her home.
I left her there smiling and thanking me while I went into the store. The store manager had seen me put her in the car and thanked me. I see the kid there at the store and chat with him sometimes, he told me someone had told me there was a lady on the ground in the parking lot. I said why the hell didn't they help her, he said, "that is what I said". We both just shook our heads and I gave him basically the same story you just read, well maybe without the narrative of my though process, not the perv part anyway.

I then saw her driving off by herself in the car I put her in. I told him that I hoped she didn't kill anyone or get killed driving home.
It troubled me some that she drove off and had lied to me and it troubled me that I actually started thinking about what I was doing as I approached her to help her. Even ten years ago I would have never though about it for a split second. I would have done it totally on instinct. I am not sure the world is changing me for the better or not. I would do what I did every time but the part of leaving her at the car was one of those damned if you do damned if you don't situations. I had no way to actually stop her from driving, not sure how I would handle that part if I had it to do over.
The situation I was in was much less stressful than the physical confrontation scenario would be, I guess I would probably step in or just call 911 and tell them the cops will be here shortly. I have a few friends that were bouncers in bars and clubs in my working class town, so they had some experience in those situations. They normally were very good at cooling things off because they were good at it and were also big strong guys. They all told me one thing I have not forgotten. If there is a man and woman confrontation, get between them but NEVER turn your back to the woman. They will often times start attacking you when you are trying to get things calmed down. They all said they would much rather deal with males.

