A genjutsu used to render the opponent immobile.
The genjutsu is initiated by sound. When the opponent attacks Akatami with a blade, she lets out a scream of fright. The sound of the scream is used to initiate the genjutsu. Akatami gets in a defensive position and the attack of the opponent seems to be successful by either severely wounding Akatami or cutting off her limb. The fake wounding is part of the genjutsu, as the blood resulting from the illusionary damage would form strings which would wrap around the opponent and leave him immobilized.