Translation issues

[dvasques]

Going into studying the rules with zys we're finding a whole bunch more doubts on the book... for starters

Rule 2-7-1-c states:
c. A valid or invalid fair catch signal deprives the receiving team of the
opportunity to advance the ball, and the ball is declared dead at the spot
of the catch or recovery or at the spot of the signal if the catch precedes
the signal (Rule 6-5-1-a Exception).

What does "or at the spot of the signal if the catch precedes
the signal" means?