If you see here, youll notice that the shot, after the cue ball makes contact with the object ball, it creates on odd spin, often being lighter than this one. What i like to do in this situation, however, is cannon the ball across the table.
Odd stance or not, the spin still makes me wonder, is this the result of the cue ball hitting off the object ball and that creates a slight spin, and then it bounces of the wall thus creating the odd turnout?
The cue ball behaves in the "strange" manner that it does in your diagram because there are 2 primary forces acting on the cue ball and they are in conflict. Each force wants to make the cue ball move in a certain way. Now the cue ball will pick up some right spin (right english) during the collision with the object ball and some more right spin when it rubs agains the end rail at an angle but english has very little to do with the bending cue ball bevavior in this example.
(1) Force # 1 Follow -If your cue ball has follow (top spin on it ... no english or side spin just follow) the cue ball wants to keep going forward even after it hits a ball and the end rail. Just set a ball up on the lip of the pocket and hit it with follow so straight that you almost chase the cue ball into the pocket right behind the object ball. You will see a cue ball that hits an object ball into the pocket, bounces off of the end rail and then dives back into the same end rail again.
(2) Force # 2 is caused by the caroming of the cue ball down the tangent line. In your example you are shooting a cut shot. The cue ball does not want to go straight to the end rail because it is bouncing off of the object ball to the right. So force number 2 is caused by the change in the direction of the cue ball due to an off center collision with the object ball.
In your example force # 1, follow, is apparently stronger than force to the right that tries to make the cue ball bounce off of the end rail and careen back down table. When your cue ball hits the end rail, the overpowering force of your follow spin moves the cue ball back towards the end rail again. The cue ball curves because the cue ball is trying to go to the right and forward at the same time. The follow spin wins out and the cue ball bends forward as it is going to the right.
* Note: If you hit the same shot with draw (back spin) the cue ball will leap off of the end rail and move back down to where you started. This is because force #1, draw, in this new example tries to make the cue ball come back towards you.
Hope this helps. Give me a buzz if you have any questions.
BCA Master Instructor / PAT 3 Examiner