here in this video u can see the implementing of the kick as i explored before prefer to do after doing a kick like normal mawashi geri or may geri or kizami may geri then do this kick as a cover after the first kick cause the enemy will be busy in defend the first kick then in worst case he will defend the other ura mawashi but if u did direct u can expect any thing from the other player cause he in this case will be able to kick ur back so watch out and do fake kick as begin