A million years ago, I stopped what I later realized was a pimp beating his prostitute in the Philly metro, just because as a teenage tourist idiot, I was too naive to realize that's what was going on, and when a man threw a woman out of an arriving subway car against a pillar and started whaling on her, I said 'what do you think you're doing?' And he looked at me like I was a moron (which of course was correct) but he did stop.
I'd like to think I would still intervene.
Of course you would, because you're a real human being.
I confess that I'm astonished that in regards to this matter, some are justifying the "guards' " lack of interest in becoming involved by how much they are being paid. I think that when we have come to the point where our sense of humanity can be bought and sold or repressed and negated through a contract, we've lost something extremely important that separates us from lower forms of life.
Thanks for telling your story :-)