Clarification: He (Ula) does not concur with Rava, who said above that 'the Kos shel B'rachah does not combine to one's detriment' ...

Conclusion: And included in those ten cups is the cup of Birchas ha'Mazon.

Implied Question: And the Beraisa, which forbids eating two of anything ...

Answer #1: Does so on account of witchcraft (and not demons).

Answer #2: The Rashbam however, explains that sometimes they (the demons) do cause damage.

Question: And what the Gemara relates in 'Mi she'Meiso' (B'rachos, Daf 20.) how Rebbi Yochanan would go and sit at the gates of Tevilah, so that the women would give birth to children as good-looking as him ...

Answer #1: Here it speaks where one meets them as they come out of the water, whereas Rebbi Yochanan sat by the gates that led to where they Toveled.

Answer #2: Alternatively, there he sat, whereas he it speaks where one meets them.

Answer #3: Alternatively, Rebbi Yochanan used to say 'Shofech Buz al Nedivim'.