What others descibe as lucky, I descibe as oversight. A scratch, for example, often prompts suprise and anger. The truth is that ALL scratches are predictable, and avoidable. Balls don't go where you want them to. They go where you put them.
Balls follow some very simple rules.
A cue ball with neither forward nor reverse spin which hits an object ball WILL move away from the collision at a 90 degree angle. Varying the speed and the intensity of the Draw or Follow will empower you to move the cueball along any line in a 180 degree arc. Actually, you must subtract the angle of approach from both ends of the arc, but for the sake of this little lesson, it's safe to assume that the cueball can get to wherever you want on the table if you learn how to put it there. It's that simple, and this stuff works every time. So using English means you must adjust your shot to compensate for the curving cueball and the adjusted angle of departure from the collision.