Shin's summons to the castle doesn't go exactly as he thought it would when the princess challenges him to a duel. Then when the aftermath of their fight goes horribly awry, it's up to Schnee to investigate. 
She'd use it to cut him down 
if he were unfaithful.
.يُفترض أنّ عليها تقطيعه به إن خانها
Es heißt, dass die Frau ihn mit
diesem Schwert tötet, wenn er fremdgeht.
Antiguamente, si le era infiel,
lo mataba con ella.
Antiguamente, si le era infiel,
le mataba con ella.
Elle servirait à les punir
en cas d’adultère.
Se venisse tradita, 
lei la userebbe per farlo a pezzi.
Supostamente a usaria para
eliminá-lo, caso fosse infiel.
Если он изменит, этим мечом
 она должна его убить.