Pull her pants down

As she struggles to free her blade, you take your chance. You don't even need superspeed for this. You quickly move behind her, dig your fingers beneath the waisteband and pull her pants all the way to her ankles, revealing her black lace panties, and matching stockings and garterbelt. With her behind exposed, the knight "eek"ed and let go of her sword in order to fling her hands towards her rear and try to cover her underwear.