Question

A car crash woke john from his afternoon nap. when he looked out of his apartment window, he saw several people milling around two smashed cars. he decided not to dial 911 because he assumed someone had already called. john's reaction is an example of

Answer 1

John's reaction is an example of the bystander effect.
It means that he will just continue staring at the accident because he is curious as to what happened and he wants to see how the event is resolved, however, he is not really willing to do anything to help the people involved - he will just assume someone else will do that.