Haha, how'd this one get dragged up again after 3 years? Well anyway it's still a good shot and interesting to discuss.
Here's a freeze-frame at the moment of impact or just after.
What this shows is:
1. Not rail first, the cue ball is touching the rail a millesecond after the 4 is already flying away.
We can also forget about jumping the ball. There IS a jump shot trick to move the cue ball when there's no angle... but this is not that trick. I saw Niels use the jump trick recently in his straight pool match with Max E. on insidepool.tv.
2. Lots of pocket cheat. The 4 is clearly moving towards the left edge of the pocket (from our perspective... it's the right edge from busty's)
3. Definitely inside english being used. You can see his cue is off to the side (and if you review the replay, you can see he started out that way.
What I believe (and I'll try testing) is that inside is not necessary to get this kind of stun draw. Only a firm slightly-below-center hit. If you hit full draw it starts backwards right away and bumps the 7. If you hit center it stuns sideways without coming backwards at all. So the secret is to hit the sweet spot right in between.
About the inside spin:
When players try this shot with inside, I believe their thinking is something like this:
- Inside causes a ball to undercut a little
- Therefore, to compensate, you must cut the ball a little more.
- So in addition to cheating the pocket, I can overcut it a hair, and just use inside spin to cancel out my overcut. The spin throws it back into the hole.
But this may actually be wrong. With a lot of testing Dr. Dave confirmed that spin-induced throw only works at lower speeds. At high speed (like the busty shot) it has very little effect. The cue ball doesn't spend enough time in contact with the object ball grab it and noticeably change its path.
So, what I believe is that most of the work is done by
cheating the pocket, turning a very slight angle into a larger one... and hitting closer to center ball than usual to increase the amount of sideways stun.
I guess it's possible there's some subtle way inside can alter the path, like it's rotating on a diagonal axis, and for a second after contact it isn't moving much and kind of "peels out" like a car spinning its wheels, except the wheel is spinning at a diagonal angle instead of the straight backward angle you'd get with center draw.
I'll try setting it up, should be fun to test.