[She draws back, watching the cut she made heal with fascination -- but when the wound is gone, the only evidence of it the scattered drops of blood around it, she pushes herself up again, using the remaining strand of the web to tie the vial around her neck, stronger than any silver or steel necklace she might find for the same purpose.]
Thank you for your cooperation. I would untie you, but unfortunately I can't trust you not to attack me... but don't worry, the magic will grow weaker after a while, you should be able to break free. In perhaps an hour or two.