לזכות ידיד נפשי ר' שמואל צבי בן ר' דוד עקיבא וכל בני ביתו!
What is the din of a co-witness of a witness became an עד זומם. One Acharon thought that it was pashut that he is disqualified because he testified that they were together and he was proven to be a liar [pants on ...].
How does this
square with the halacha that if one person testifies about something and says that Ploni was with him and Ploni denies it he is not disqualified because people don't always notice carefully who was with them?