ROB: actually, the Rosh argues with Tosafos.
I don’t see how anyone can claim that Reb Moshe held that turning off the gas is a grama without bringing any source, when he wrote in 3 published teshuvos that it is kibuyi mamash. I don’t see how it qualifies as a “well accepted idea” when no one says so. Please bring a single published or quotable source.