So, what ya gonna do if a person who has been drinking and a mental patient fight in front of a oncoming train?
Go help the victim, while having the potential of being pulled into the train.
It is easy to be brave from a distance.
Maybe so. I'm pretty far away, but this strikes me as notable: "there were disquieting reports that none of the 18 bystanders bothered to help Han. Yet various witnesses said he was on the tracks for a minute or more, scrambling to pull himself onto the platform." At least the photographer got a well framed and clear shot to sell while he was running to aid the poor man.
I've learned never to turn your back near a train, or while sitting on stadium seating with a goon behind you[watch the volume levels].