Bernard King didn't intentionally keep secrets from Gan Guoyang; it was just that the subtle techniques involved in a turnaround jump shot were not knee-friendly.
Originally, to speed up his turnaround jump shot, King not only pivoted on his heel and shot without using the backboard while only looking at the rim, but he also had a clever trick of turning as he jumped.
He used the twisting force of his knees to propel himself towards the baseline, turning mid-air as he jumped, thus merging the "turnaround" and "jump" into one swift motion as much as possible.
Such a move put great stress on the knee ligaments. During his time with the Nets and Warriors, King employed this type of turnaround movement quite frequently.
Later on, when he was in New York, he practically stopped using this technique and began to rely more on experience and other details to evade defense.
