While Cinnamon's not the kind of opponent the Knight of Ivalice usually faces, his approach will be pretty much the same as usual. A Crystal Shield to evade her attacks, high HP to survive in case anything connects, and use his durability to buy him enough time to break her weapon, thereby completely rendering her helpless on offense. While she may be resilient to his usual Ice Brand/Black Robe combo, he can always substitute it for the Rune Blade instead, and equip heavy armor to further boost his defensive capabilities. While not a fight he's geared to win in a straight out slugfest, Knight's certainly got a firm strategy that can secure him a win through indirect methods.