So then there needs to be a definition of stroke??
I would consider the stroke to start when the shooter is down on the ball and ends when the shooter picks up his bridge hand. Otherwise does air stroking count as beginning of stroke? What about follow thru, is stroke considered to have ended as soon a tip/cue ball contact ends?? So many questions. It would be easier if it read that cue ball foul only was suspended when an impeding ball requires jump or masse shot.
DEFINITION OF STROKE (BCAPL)
The motion of the cue from the time it begins its forward motion, through the time the cue tip strikes the cue ball, and any further follow- through motion of the cue.
The whole point of this rule is that you cannot move an impeding ball to allow the cue ball to get around or over it. There is no way that the cue ball is still behind the impeding ball after the forward motion of the cue is over. The only extreme case I can think of is that you are trying to jump at an extreme angle and the cue ball goes almost straight up such that it would land on the impeding ball, then when you backstroke you move.the impeding ball. But I claim that would be a foul under the regular disturbed ball rule.