The baby elephant chases his friend down, just to try and get a bite of the tasty watermelon.
I have to say, that guy is pretty brave. If a hungry baby elephant were chasing me, I would totally just give him the watermelon. Don't stand in the way of a man and his food - especially when that man is a large, playful elephant.
I'm sure he got the watermelon eventually. Baby elephants seem very persuasive.