“Your Highness. With all due respect, I’d love to offer you a few words of advice.”
“First of all. Don’t let a prisoner of war out of your sight. You mustn’t leave them alone, even in a locked room. If you can’t be there yourself, post guards inside the room with them. At least two.”
“Second. Always search your captive for weapons more than once. If you have an underling frisk a prisoner, you should do the final check yourself. Honestly, you shouldn’t leave them clothed—strip them completely. That way they won’t be able to hide any weapons or tools to aid their escape. This is especially important if the prisoner is a woman. If she’s indecent, she’ll feel she can’t run away, and she’ll be afraid to try.”
“Third. You neglected to bind my hands and feet. When you do bind a prisoner, make sure they’re in handcuffs and that the base of their thumbs is tied off with a durable rope. As for their ankles—I imagine this goes without saying, but it’s best to fasten them to a pillar or a bed, something solid.”
“But even with all of that, it’s still half-hearted. Do you know how best to ensure someone can’t run away?”
“You break their arms and legs.”
Amekawa, Touko. 7th Time Loop: The Villainess Enjoys a Carefree Life Married to Her Worst Enemy! (Light Novel) Vol. 1 (pp. 208-209)