Reply To: Split: Chidushim on Daf Yomi

שבת כט, ב

The Rosh in Betzeh (2,17) explains that the removing of oil is not a cause that the light go out but direct putting out of the fire since this egg shell with oil is part of the burning system and the removal of oil is disturbing the system.

What is the difference between a פסיק רישא (cutting a head off the chicken and not wanting to die) which is chayev and a מלאכה שאינה צריכה לגופה, work not for its own sake, is patur according to Rebbi Shimon? The Kesef Mishneh Hilchas Shabbos (1,7) quotes the son of the Rambam, Rabbenu Avraham that by psik resha he does not have any machshava to do the work and its happening automatically whereas in a work not for its own sake there is a machshava to do it but not for the purpose it was done in the mishkan.
Asks the Machtzis Hashekel O’CH 278,1 according to this a psik resha should be better since he has no machshava at all? He explains that by work not done for its own sake he actually has an opposite machshava not to do it like in mishkan, therefore he is patur whereas in psik resha he has no machshava. The Rambam does not hold this logic and holds that doing work not for its own sake is also chayev.