Aiki point of view? Sugi/irime ashi into it. I mean really a high RH is more of a training thing than an actual combat technique because it leaves it's user very open to counter attack. During the execution of the kick you're not exactly in a brilliant position balance wise with any kick and a high RH is about as bad as it gets.
Anything which connects during the excution is almost certainly going to dump them on their behind.
Which is why you should punch them in the face before kicking them in the head.