An Illustrated Manual for Inflicting Violence: A Guide to Fightering

[Ryuu Hayato]

If you want to use a versatile weapon then you should take Defensive Fighting Style. This allows you to freely switch between 1 and 2-handing your weapon without a loss of benefits. Get creative with how you use your free hand. Grapple checks (Samurai practiced Judo as an integral part of their fighting style), carrying a torch, hanging from a rope, etc.

The problem is that duelist will give +2 on d8 and a person can use a shield giving +2 ac, so he will have a better damage and ac. Duelist is really op.