Vegas is a crappy place. I let a black woman get abused. Should I feel bad?

What would you have done?

So... I am in Vegas...and a black woman asks to use my phone.

I see someone watching from my side. So I say no, expecting something weird was going on.

She asks me to Google the nearest cellphone store for her. I tell her to hold on a second.

The guy who was watching runs over and slaps her in the face. He tells me not to help "a bitch doing me dirty." Then he swings at her and she's hides behind me. At this point I am like why are y'all involving me in some dumb shit.

So I step back from them as he goes and chokes her.

Anyway the cops dealt with it, but I guess she called the cops on him earlier claiming he hit her so he broke her phone. Now I feel like a jerk for not helping her.