Rav Masnah: If wood fell from a tree directly into an oven on Yom Tov, one can add prepared firewood and kindle a fire.
Challenge: But he must turn over the wood and he will be handling muktzeh?
Resolution: Since most of the wood is permitted, we say that the wood he is turning is permitted wood [the forbidden wood becomes battel].
Challenge: But then he is being mevattel a prohibition as a matter of course, and We Learned: We cannot nullify a prohibition as a matter of course.
Resolution: This is true regarding a Torah prohibition, but a D’Rabbanan prohibition may be nullified [Tosfos: A D’Rabbanan prohibition that has its basis in a Torah law (such as Bassar B’Chalav D’Rabbanan), is considered a Torah prohibition for this purpose].
Challenge: Rav Ashi (012) holds that even a D’Rabbanan davar sheyesh lo mattirin cannot become battel, so the firewood should remain forbidden?
Resolution: This is true only in a case where the issur would remain in existence, but here it is in the process of being destroyed and we do not consider it a davar sheyesh lo mattirin.
We Learned: A two-day Yom Tov in Chutz La’Aretz [any regular Yom Tov]: Rav: An egg laid on the first day is permitted on the second day. Rav Asi: It is forbidden.
Question: Does this mean Rav Asi considered both days of Yom Tov as one long day? Rav Asi would make havdalah on the night of Yom Tov [the end of the first day, to separate it from the second day]?
Response: Rav Asi was unsure of whether they’re considered one long day or two separate days, and he was stringent both ways.