It requires ten to remove it - צריכי בי עשרה למשלפה
Summary:
The חכמים applied their תקנה (of nullifying the ביטול) even to the two whom he was מבטל, in order not to distinguish them from the others who are not בטל.
And רבי retracted and ruled like רשב"ג, etc. - וחזר רבי ועשה כרבן שמעון בן גמליאל
Summary:
We compare the two case of שום הדיינים and ביטלו בבי"ד to each other because they are the only two instances where רבי ורשב"ג argue regarding מה כח בי"ד יפה.
Summary:
According to רשב"ג even if he is מבטל all the עדים, but if it is זה שלא בפני"ז, it will not be effective, even if we maintain that his reasoning is based on עדות שבטלה מקצתה בטלה כולה.