I wonder if duelist with 3 or more arms (e.g. alchemist discovery - vestigial arm), may have weapons in two hands and forgoe attack from one hand to benefit from his parry class ability and still be able to benefit from crane wing and riposte feats as his 3rd hand stays free?
And if its possible, then can duelist make attack opportunity (from crane riposte feat) after he failed to parry incoming attack, which anyway missed him by 4 or less?