Once the working link was posted I remembered watching this match once before.
That wasn't the first time I've seen Corey do basically the same thing.
From first-hand experience trying to get this shot to work in the way Corey did it,or the several variations I was shown by Grady,you will be REALLY surprised at how full you have to hit the object ball with a LOT of draw,and about a full tip (for me anyway) or maybe more for you of inside or left spin here.
There is also an example of Nick Varner doing basically the same thing in a little clip from Accu-Stat's that you can watch on the Billiards Digest home page under the Stroke of Genius link,but Nick gets it to work with what LOOKS like low RIGHT spin.
Nick's version takes almost the same type of shot,and sends the cue ball side to side,then takes a path something like Corey's did.
The difference here is the ball he was playing position on was in the middle of the end rail,and Nick had to be on the complete opposite side of the table,about where the 9 ball is on Corey's shot. Nick's cue ball comes off the 2 rails in that corner from there,and winds up about where Corey's cue ball is angle-wise,but on the other side of the table.
This is NOT the so-called Sputnik shot Efren and Bustamante use,that technique is something like what you would do if Corey had shot the 4 with severe inside left,and went 3 rails forward and wound up where he actually did.
That shot has to be hit like you aren't even serious about making it,and just goofing off trying something new.
This would be like Corey shooting this with high RIGHT,having the cue ball jump off the rail,come across table in a banana shape,and having the ball reverse and go 3 rails forward and leave whitey where the 9 was roughly.
What amazes me about this shot is how fully Corey is hitting the 4 to have done this.
The times I've gotten this shot to work it was much easier to have a steeper cut angle,and cut the ball in using more or less pure left side spin,and much less draw.
I've even used it when slightly underneath the object ball,and have to cut it backwards,and have the cue ball come 4 rails and put me in position to shoot the next ball down the long rail when it's close to the side pocket,and only makeable from that side and from close to it.
The shot I'm describing now is reliably done from the cue ball position where Corey shoots the 9 ball while completing the out.
(Update after this first post of mine. What I mean when I refer to how fully Corey hit the 4 to make the cue ball take it's path is this. If you make the ball but overcut it into the pocket,I don't think you CAN do what he does here. It also takes a world-class stroke,pretty new cloth and balls that are close to brand new as possible.)
In the places I typically get to actually play,what he did here would be an almost guaranteed one-rail scratch in the side.
Hope that makes it clearer and maybe more helpful. Tommy D.