/follow and when you attack you use the key that you have set to "interact with target" in the key bindings (make sure its the same key on both characters if you want both melle to attack at one time). But Shaman is choice of most newer boxers as they can cast, but you do need a tank.

So /follow on the slave for movement, then move the main

Then on the slave

/assist main

macro key

then hit the key you have set to "interact with target".

It will require two key press.