I disagree with 'bully' because what he did was premeditated assault. And videotaping it makes it worse.
He committed Assault and Battery:
In common law, criminal assault was an attempted battery. The elements of battery are (1) a volitional act<6> (2) done for the purpose of causing an harmful or offensive contact with another person or under circumstances that make such contact substantially certain to occur and (3) which causes such contact.<7> Thus throwing a rock at someone for the purpose of hitting him is a battery if the rock in fact strikes the person and is an assault if the rock misses. The fact that the person may have been unaware that the rock had been thrown at him is irrelevant under this definition of assault.
http://en.wikipedia.org/wiki/AssaultWith the taping it would be charged as a felony.