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Today’s Daf Yomi Question:
The Gemara says there were not enough people to (around Rav Chanilay) to reach the Techum. Why couldn’t they simply walk him along until they all reached the Techum together; since even a mobile Mechitza is valid?
When Rava had a human Eiruv it was because they were walking him. Perhaps it is a matter of practicality. He was able to gather people to that area but to get them to come out and then right back in, without knowing why they are doing that, would be quite a feat to accomplish.