Wave slack trick help

Hi, guys. Recently I am sooo into slack and whip tricks and I just saw something quite interesting as many ppl starting to do it and is called “wave slack”. I found it on yoyo.wiki but couldn’t understand the concept very well so can anyone post or link me the tutorial for the wave slack trick ?

Ask this guy: http://yoyoexpert.com/forums/index.php?action=profile;u=619

He created it. :wink: