Leanna wasn't concerned with the three people in front of her. They moved well and appeared calm and levelheaded, but the knight had several advantages that made things simple for her. Most notable, was that she had some of the best forged metals in the world. High quality nickel, steel super alloys with complex mechanical joints that allowed zero restriction in movement. Unless the had magic weapons, her gear advantage was almost insurmountable.
Second was simpler, she was really good as a knight. Lord Dyne provided a complete training pipeline, regular cyclical training cycles, and a considerable amount of secondary and specialization training. This included a three-week set in urban combat, where Lady Dyne found people to pass these skills on the knights never knew but they were on par with the best troops in the world.
