Six is well aware the things that Luka has done with a weapon, if Luka went for the blade he'd find himself in a new situation. But as Luka mentions brass knuckles, he'll hear a soft clinking that he would easily recognize as something metal droppong on something metal as the sword turns into brass knuckles.

"Are you royalty, Princess? Should I bow like people do in stories?" He asks, his voice entirely curious in this moment.