Apparently today is International Bystander Awareness Day so here's an old guest blog from a bystander who intervened. I always aspire to be braver than I am in these situations:
https://www.girlonthenet.com/blog/intervening-in-harassment/

@girlonthenet
I once intervened by walking up to the guy with a big scowl on my face
"Bruce ... you arsehole. You thought you could hide, but here you are. Where is our money, Bruce? Do we need to take your toes with a boltcutter to get you to pay your gambling debts?"

While My Dude was trying to explain that he was not Bruce, the girl vanished.

@screwturn

Very cool, if true. In fact, very cool anyway - I'd probably watch that movie clip if it posted! And kudos, of course.

@girlonthenet

@bytebro
I mean, I am 6ft2, and I was wearing dirty jeans and a biker jacket and boots, obviously packing a gun, and had wild hair a big beard. So it was believable.

@girlonthenet