Knock Them Off!

This is a PvP minigame I am constructing. It is entirely Vanilla Minecraft, although it only works if Command Blocks and PvP are enabled. The goal of this team game is to use your Punch bow to knock enemies off their wall, without getting hit yourself! It is not finished yet, but I am hoping to finish it fairly soon. Although it is primarily just for small games with friends, if you want to make a server of it, please tell me in the comments section. I will put a World Download when I have finished the project.