It's just to make it smooth and just cooler, I start with trapeze, bounce it back like you are doing jade whip do under pass, bounce it again (now with the slack too) and guide the slack behind your wrist (just like wrist whip), catch the slack with your thumb and do a trapeze where the yoyo lands on the middle string shown in the video.
Heres the main idea:
-Hold the string that connects to your throwhand middle finger with your thumb
-pull out your wrist
there will be an X formed by the string
-release the string on your non-throwhand index finger
you should've been arrived at paris (eiffel tower)
-now release your throwhand thumb. Oops!! I mean the string on your throwhand thumb
you should be in double GT
-finally grab the lower GT (formed by the double GT) with your non-throwhand index finger
Finally!! you arrive at Green Triangle
now just dismount like how you dismount a basic GT..
Hope you can understand my tutorial and hope you enjoy the tricks..
It's not that hard. This is basically a wrist whip with the yoyo lands on the wrong string which makes it cool!!