I don't think this idea would be good for pking at all...alot of people just spam arrows/bombs, and sword anyway. Barely anyone tries to run around and get clean hits, which is what will happen with the spin attack. I think maybe a dodge button would be a useful thing since it would take practice to be able to time it right. Plus dodging wouldn't make killing people easier, or give an unfair attack advantage to anyway since no damage is delt.