When it comes to fighting i know what i'm talking about! I'm not being big headed just honest!
Firstly DO NOT hit this guy!!! believe it or not there is a big risk of seriously injuring him if you catch him right (in the jaw or temple etc. Or if you hit him anywhere hard enough) or even killing him... Yes thats right, you can end up accidently killing a person if you knock them to the ground and they hit there head on concrete! It happens more than you may realise.
secondly, most (if not all) bullies are scared and lack real confidence, thats why they pick on only people who they think they can physicaly dominate. what you need to do my friend is learn gracie jiu jitsu. Its the only proven system of self defence that enables a weaker smaller person to defend themselves again bigger and stronger people!
Don't take my word for it though, Look at some youtube videos of it. gracie jiu jitsu is what started off the ufc (cage fighting as its commonly known) for the last 100 years gjj practicioners have been proving there style over others via an open invattion to all comers regardless of size, strength and athletic ability and fighting knowlegde!
If you wanna leanr it, which by the way anyone can. Go here to start yourself off... www.gracieuniversity.com
Any questions just ask me!
All the best
And as the late grand master once said " A few honest unafraid words will put a bully in his place"
George