NFL Fair Catch Question

[VALinesman]

The NF has a rule that addresses an invalid fair catch signal, but it does not appear that the NFL does. I believe it was the Ind game last week where R made a wave just below chest high, and K let up, and R took advantage and scored on the return. I was pretty confused, as I thought that you awarded a fair catch in NF, NCAA and NFL even if the signal was invalid. Does the NCAA rulebook address that issue too?

[Etref]

Here is the NCAA version



Invalid Signals
ARTICLE 3. a. During a down in which a kick is made, no player of Team B shall
make any invalid fair catch signal during a free kick or beyond the neutral zone
during a scrimmage kick. Any signal is invalid after a scrimmage kick is caught
beyond the neutral zone, strikes the ground or touches another player beyond the
neutral zone. A signal is invalid after a free kick is caught, strikes the ground or
touches another player (A.R. 6-5-3-IV-VI).
b. A catch after an invalid signal is not a fair catch, and the ball is dead where
caught. If the signal follows a catch, the ball is dead when the signal is first
given (A.R. 6-5-1-II).
c. Invalid signals beyond the neutral zone apply only to Team B (A.R. 6-5-3-II).
d. An invalid signal beyond the neutral zone is possible only when the ball has
crossed the neutral zone (Rule 2-15-7) (A.R. 6-5-3-I).

[VALinesman]

Here is the NCAA version



Invalid Signals
ARTICLE 3. a. During a down in which a kick is made, no player of Team B shall
make any invalid fair catch signal during a free kick or beyond the neutral zone
during a scrimmage kick. Any signal is invalid after a scrimmage kick is caught
beyond the neutral zone, strikes the ground or touches another player beyond the
neutral zone. A signal is invalid after a free kick is caught, strikes the ground or
touches another player (A.R. 6-5-3-IV-VI).
b. A catch after an invalid signal is not a fair catch, and the ball is dead where
caught. If the signal follows a catch, the ball is dead when the signal is first
given (A.R. 6-5-1-II).
c. Invalid signals beyond the neutral zone apply only to Team B (A.R. 6-5-3-II).
d. An invalid signal beyond the neutral zone is possible only when the ball has
crossed the neutral zone (Rule 2-15-7) (A.R. 6-5-3-I).

Thank you very much....