I'd say in this case where there were already a lot of people, there wasn't any moral or legal obligation to stay. You didn't witness the crash and they didn't seem to need anymore help.
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I got in a fight one time with a really big guy, and he said, "I'm going to mop the floor with your face." I said, "You'll be sorry." He said, "Oh, yeah? Why?" I said, "Well, you won't be able to get into the corners very well."
Emo Philips
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