I just popped back over here to say, thanks to Possessed for reaffirming my faith in humanity for today.
Something similar happened to me once.

Walking home from a friend’s house I saw a very drunk, very young man in a fury because a man I had met once about a month or so before was walking out of a private club dressed as Emma Peel (the first time I met him he was in plain clothes so I didn’t recognise him at first though I knew from conversation with him and his girlfriend that this was a thing he did).
To be honest I was more worried about the young chap because he was about to start hitting way above his weight. This guy was in high heels and wasn’t taking shit from anyone they were staring each other out and screaming the place down.
I stood between the two of the them with my back to the younger chap and locked eyes on man in a dress and started walking him and his very scared friend (dressed as my nan) up the hill without turning around.
Okay it’s only slightly similar. I don’t know where the inspiration to intervene came from, I didn’t really think it through, I just sort of found myself there breaking it up.

You stood in the way of danger and I applaud you.

As for your bank account what’s the bank’s policy on identity theft?
I had an ex who forged my signature and got credit cards in my name and used my cheque book to buy items. In the end this went into the tens of thousands, I went into the bank and they pulled a copy of the cheque and I convinced them that my handwriting was not the same as that on the cheques or the credit card applications and they liased with the other card companies to get all charges waved and the funds returned.
Many banks have insurance for this sort of theft, I’m not sure if the laws are similar over the pond.

Best of luck and take care.