For what it's worth ...
The new 9-1-11 says it's a foul if a defensive player leaps over an opponent (inside the tackle box) to block a punt. A punt is a kick. So, if the would-be kicker does not kick the ball, there is no punt; hence, leaping is not illegal.
Not unequivocal, but a strong inference.
I agree, that is the inference. But if true, it is a poorly written rule.
EXAMPLE: Rusher leaps over the shield, punter sees the leaping rusher, so he steps to the side, and winds up getting tackled by another rusher. The leaper is upended by the shield blockers, lands on the head of a blocker, injuring him, and he lands on his own neck and is also injured. There was no punt, therefore, by the above inference, the leap is not a foul.
However, the leap was the reason there was no kick, and the leap was just as dangerous whether the ball was kicked or not. If the purpose of the rule is to protect both the leapers and those blocking him, it should be a foul if A is a scrimmage kick FORMATION, whether an actual kick happens or not. While a kicker isn't a kicker until he kicks the ball, a blocker is still a blocker even if there is no kick.
And it isn't an advantage issue. A gains no advantage for B to be restricted from leaping even if there is no kick. In fact, B is in BETTER position to defend a fake if he doesn't leap. So it makes no logical sense to require a kick in order to restrict leaping.