Rule 10: Section 1: Article 4- Supplemental Note (2).A BS call on the punt and it should be ND ball right now!!!
"After a valid fair catch signal, the opportunity to make a catch does not end when a kick is muffed. The player who signaled fair catch must have a reasonable opportunity to catch the ball before it hits the ground without being interfered with by the members of the kicking team."
Correct call, by the book.