The location of Dragon Tooth Platform was quite wondrous.
It sat at the juncture where the dragon's neck met its torso, right at the center of the shoulder blades of its wings. When the dragon flapped its wings to fly, the Dragon Tooth Platform was perfectly sheltered by the wings. This ensured the knight's safety; only when their back was exposed would the knight be vulnerable.
The gap left between the wings and the neck was the Dragon Knight's area for attack.
The length of the Dragon Lance didn't need to be longer than the dragon's body, as the Dragon Dou Qi could be projected outward. The lance only needed to ensure it could reach through the gaps created by the vibrating wings, aiming in all directions. Real close-quarter killing required the dragon to cooperate by rolling over so the knight could attack back to back.
At other times, the dragon would act as the main force in close combat, and the knight would focus on outputting Dou Qi.