This is your fight or flight reflex. The kid that ran is using the flight, which means in a dangerous situation he is more likely to run. The kid that kicks the doll is using fight, so he is more likely to fight in a dangerous situation.
LOOK: What A Barbie Body Would Look Like In Real Life - At this point, it's common knowledge that Barbie's body isn't the most realistic. But what would it actually look like if the famous Mattel doll was a real woman?