Bob.... this is a fact.
Hitting the same contact point on a cut shot at a high speed.... INCREASES the CUTTING of THE object BALL. ...
Yes, and I measured that effect about 30 years ago and put it in an article in Billiards Digest.
Here is a plot of the measurements from my June, 1995 BD column. The "soft", "medium" and "hard" lines refer to the speed of the shot. For a 45-degree cut, a soft shot throws about 5 to 6 degrees. For a hard shot, it only throws 2 degrees. Up to a 15-degree cut, the speed makes no difference to the cut angle.
The point relative to the current discussion is that the throw is never negative. If you are cutting a frozen ball down the rail, any shot without side spin that hits the ball and cushion at the same instant will throw the object ball into the rail and likely miss if it's more than a couple diamonds to the pocket.