Long Live the Kings, Part II - S3-E19
Corrected entry: When Mikayla is tied up by the Tarantula People, the rope is only around her upper arms with the knot in front. Since her hands were free to move around as we saw when she was talking, a warrior as skilled as her should have been able to untie herself and escape.
Correction: So she decided to play it safe and stay put; you can't categorize your assumptions about what a character should have done as a mistake.