His defense is very, very good, but for a moment he seems to lower his guard, inviting a thrust. If she takes advantage of it he'll counter her thrust with a turn away from the incoming thrust, his right side swinging back like a gate as he unleashes left-handed back knuckle intended to smash her hard in the nose, the same move he used to best Lucius, his better in blade to blade combat amongst the Emperor's Children. It will only work once, and probably less well against Signum, who has already changed up and used a few kicks and non-traditional strikes instead of being blindly obsessed with sword-work as the Captain of the Emperor's children was.