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When does damage occur—when you throw the object or when it breaks? The shiur analyzes the machlokes between basar mikara and basar tavramona, distinguishing between the moment the maisa hezek begins and when the chefetz loses its shavus. Rashi (רש"י) and the Tosfos are shown to hold fundamentally different positions on why a second damager is exempt.
This shiur offers an in-depth analysis of Bava Kamma 17b, focusing on the Gemara (גמרא)'s fundamental question of when damage is considered to have occurred. The discussion begins with Rashi (רש"י)'s comment that the second damager is exempt, and the Ramban (רמב"ן)'s challenge: if the reason for exemption is that the object has no value (ain lo damim), why does it matter whether you threw a stone at an object (zorich even) or stepped on the object itself (zorich kli)? In both cases, there should be no value. Rabbi Zweig develops the Tosfos's position that there is a fundamental distinction between zorich kli and zorich even. When you step on an object (zorich kli), the damage assessment follows basar mikara—the moment of initial contact. When you throw a stone at an object (zorich even), it follows basar tavramona—when it actually breaks. The Tosfos proves this from the Rosh's question about throwing an object from reshus harabim that breaks in reshus hayachid, where the Gemara's principle of basar mikara should exempt the damager, yet the Rosh says there is liability because of bir bestacha.
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Bava Kamma 17b
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