One has to consider the circumstances. This man was pushed to the tracks by, apparently, a raving lunatic, who was still nearby. Do you not only risk your life trying to save the man, considering he might accidentally pull you down onto the tracks with him, or perhaps the raving lunatic might try and push you in front of the train as well?
It's not so easy to sit back and say someone should have tried to help, given the circumstances...
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