Karen was crossing Main Street at a crosswalk. John, who was on the sidewalk nearby, saw a speeding automobile heading in Karen's direction. John ran into the street and pushed Karen out of the path of the car. Karen fell to the ground and broke her leg. In an action for battery brought by Karen against John, will Karen prevail? 
Yes, because John could have shouted a warning instead of pushing Karen out of the way.  Yes, if Karen was not actually in danger and John should have realized it.  No, because the driver of the car was responsible for Karen's injury.  No, if John's intent was to save Karen, not to harm her.