If the Bronze manual says it's ok to walk parallel to the boards while playing a left to right shot, the manual needs some work.
It would require a loopy arm swing that would be next to impossible to repeat.
Imagine a top down view of the bowler, and the arm swing. Walking parallel to the intended path keeps the arm swing on the intended path the entire way.
Walking parallel to the boards would be walking diagonal to the intended path.
There is no good way to describe the route the ball would have to take to end up on the intended path.
If you start the ball towards your target, then move your shoulder left of that path, the ball is not going to return towards that target.
One thing I do see quite often (because people need to walk around the ball return), is to walk left until the power step, then while the ball is at the peak of the backswing (very little forward momentum), they change directions, push off the power step, and slide parallel to the intended target. Again, not easy to repeat, but well within the tolerances of today's conditions.
If that happens to return to the same board they started on, it's coincidence.
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