※ 引述《lusfv (Lus)》之铭言：
: https://twitter.com/OfficialNBARefs/status/1075073263922020352?s=19
The offensive player gathers the ball while on his right foot. He then takes
a step with his left foot (step 1) into a hop step, landing first with his
right foot (step 2) and then illegally with his left (step 3). We missed
this one - it is a traveling violation.
简单来讲，裁判就认为哈登左脚(Step 1)垫步之后的落地没有双脚同时落地啊，但是哈
登这招很多年了，所以我才会认为是裁判算成同时落地所以过去都没有吹判啊。裁判现
在突然清醒要这样判，我希望以后都能保持同一套标准啦。
另外来看一个合法的双重后撤步，这个就很标准没有走步了。
https://youtu.be/Zzb2V0BHROg