- Question: Why do two sets of witnesses combine to testify about what happened in the middle even if they saw it from opposite side windows and the public domain is in the middle but a group of people on either side of a public domain who can even see each other cannot combine for a zimun of Birkas hamazon?
A. The testimony case is a Mishna in Makkos daf 6b and the question is asked by the Responsa Hilchos Ketanos volume 2 chapter 147 based on a Beis Yosef in Orah Chaim chapter 195 in the name of the R”I.
B. The answer is not like the Aruch Laner who said the case in Makkos is not dealing with a public domain in the middle.
C. What is the “combine” factor that is by testimony but is not there by a zimun?
Answer: By a zimun if the public domain is in between the group they are not considered together and there is nothing to combine them. However by testimony where they in fact come together in court to testify that is considered a form of combining, it is just that in order to be considered one group some of them have to see each other as well when they witness what they are testifying about.