Acording to Kasumi Iwato and Tomoe Karijuku of Eisui, whenever Sae puts her mark on someone, her opponent wouldn't be able to complete a single hand, its like her gaze blocks an opponents hand from coming together. However, she becomes visibly tired when overusing this ability to the point where she is breathing heavy and stumbling about. Sae's monocle has been shown to cloud up to warn her something big is coming from an opponent.
