It is easy to tell he did it on purpose, I don't know why he didn't but what he did is completely wrong, and the Mother need to do something to prevent him from being a worst person. He's quite young I don't know what he will do in the future if no one teaches him properly from now. Where is his father? Is he being raised by a single mother? Every child needs a father to discipline him. Every child needs to be discipline into a proper human being by a Strong figure like a father.