Rosh Yeshiva of Yeshivas Bais Moshe Chaim
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Why is moshit (carrying from balcony to balcony over reshus harabim) liable above ten tefachim when normal carrying is not? A fundamental machloket emerges between viewing moshit as a gezeirat hakatuv creating new liability in airspace versus understanding it as reshus hayachid to reshus hayachid transfer. This distinction determines whether height restrictions from the Mishkan must be maintained exactly.
Why are two people who jointly perform a melacha both exempt rather than both liable? The shiur resolves contradictions in Tosafos by distinguishing between the gavra and cheftza perspectives on melacha performance. This chakira explains why partial acts like akira alone have melacha status yet joint performance creates exemption.
