For example, if you see some child running out into the street (especially with cars coming) - you would certainly want to grab the child from the ensuing danger.
True enough. An uncle of mine one time saw a big box in the middle of the road while he driving along. He thought to himself there might be a kid playing inside so he stopped to check (some might have just hit it for the hell of it). Sure enough there was a small child inside so he got it out and went up to the nearest house and knocked on the door. When he tried to explain what happened he got balsted for disturbing the woman (and she was in fact the childs mother). Unreal but it happens.