Was there a duty, moral or legal, to intervene?

Jordan Neely was killed with a chokehold by Daniel Perry in a New York subway while bystanders watched and to some extent assisted Perry.

Perry has been charged with manslaughter.

Did the bystanders have a moral or legal duty to intervene and stop the killing?

Bystanders had a moral duty to stop the killing.
Bystanders had NO moral duty to stop the killing.
Bystanders had a legal duty to stop the killing.
Bystanders had NO legal duty to stop the killing.
Bystanders had no legal or moral duty to do anything at all
Select gender and age to cast your vote:
Was there a duty, moral or legal, to intervene?
Post Opinion