"Safe (no catch)" signal, repeat with emphasis; okay (by some) to verbalize "NO CATCH" (but be loud and particularly clear about the "NO!!!"). Maybe even better, just the word "NO!!!" while signaling, so no one can claim they only heard the "catch" part of "no catch". Still better to give them some indication, even if imperfect, than none at all.
Any way you do it, some one will say you didn't tell them soon enough, whatever. At that point, it is their problem, not yours.
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Steve
ASA/ISF/NCAA/NFHS/PGF
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