“against can have the meaning in comparison to. They are on opposite sides being matched up with each other.”
Precisely. The two are “not the same”.They are being compared, meaning there are distinctions and differences between them that are being noted. That is in contradiction to what is meant by “seudah shlishit is k’neged spiritual attributes of shabbat”
In order to understand the use of “against” in this context, one must first translate it back into the Hebrew k’neged, and then switch to the medrashic use of the word instead of its more direct meaning. Convoluted.
I’m signing off.
Shabbat Shalom and Chag Sameach from Israel the Zionist Jewish State.
Gut Shabbes and Gut Yuntiff from Eretz Yisroel.