Not every day a mere soldier gets to square off against a noble and not get in trouble for it. Of course, Tsai of the Divine Spear isn't a 'mere' anything, being not only a master of his chosen weapon but a skilled craftsman of the arms as well. So you can be sure that he'll be bringing nothing short of a masterpiece weapon to the arena with him. That's only a minor detail, but General Milich seems to have an eye for quality, so he'll surely appreciate being gutted by a true work of art instead of some iron pole, right?