Related for Ketubot 39:5
א"ר אבהו אין מזימין את העדים אלא בפניהן ומכחישין את העדים שלא בפניהן והזמה שלא בפניהן נהי דהזמה לא הוי הכחשה מיהא הויא
Abbahu said: They rebut witnesses only in their presence, but they contradict them also in not in their presence. And a rebuttal in their absence — granted that it does not count as rebuttal, but it does count as contradiction.
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