rabbiofberlin-
…the gemoro says (shabbos 123) that you can be “kofin kaarah al haner shelo teochez es hakoreh”- you can cover the candle with a cover so that the ceiling does not catch fire’ (there is your answer ICOT)…
So it would appear.
Thank you.
PM-
Generally speaking “grama” refers to something that takes place with a significant time delay, not a situation where the result of your action is instant. I don’t know how Tosfos deals with this, but I see that the universally accepted Halacha is to consider turning off the gas true kibuyi.
Based on this, cutting off the gas where it enters the house would be less problematic, since it would continue to flow from the burner until the gas lines in the entire house depressurized, which wouldn’t be instantaneous.