Drest is caught because of the talisman Emerick gave her means that she cannot be trusted, and she is thrown in jail. She realizes that there are ledges and cuts the rope.
Storyboard Text
"Drest the Clever" "Drest the Brave"
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"Drest the Weak" "Drest the Trusting"
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The knot is to strong. Luckily, I have this knife hidden on me.