Implied Question: Why did the not ask 'If so, the same ought to apply even by a Nochri from a Nochri'?

Answer: Because he asked even better, since otherwise the Gemara would have answered like it will answer later.

Clarification: This is one decree, since the Chachamim decreed on all fire ofa Nochri in the hands of a Nochri.

Proof: Because if not for the one, the other would not last.)

Conclusion: But a Nochri who lit from a Yisrael and a Yisrael from a Nochri, one may recite a B'rachah. And this is the Halachah.

Explanation #1: Rashi explains that if that is so, they lit it on account of the Kavod of the important dignitary, and not for its light.

Explanation #2: Rabeinu Chananel however, explains the opposite - that by an important dignitary, one kindles it for its light, whereas when there is no important dignitary, one does so in honor of the Shul (See Maharsha).

Clarification: Rashi explains one does however, recite the B'rachah of 'Baruch she'Bara Shemen Areiv'.

Implied Question: Why did we learn above in Perek Keitzad Mevorchin (Daf 43.) that over spiced oil one recites 'Borei Atzei Besamim' ...

Answer: That speaks when one comes to smell it, and not in the middle of a meal.

Explanation #1: Rashi explains that this is four Milin.

Refutation: Tosfos however this is less than this is less than 'a small Achilah'.

Explanation #2: It therefore seems that one should explain the other way round - that 'a big Achilah' means as long as one is not thirsty, since there is no fixed amount (See Tosfos Ha'Rosh); whereas 'a small Achilah' is four Milin (See Maharsha).

Halachah: This applies specifically to them, since they used to wash their hands after the meal on account of Sedomis salt ...

Halachah (cont.): But as for us, among whom Sedomis salt is not common, for which reason we do tend to wash our hands after a meal, washing our hands does not prevent us from Bensching.

Halachah (cont.): Finicky people however, who do tend to wash their hands after a meal, washing their hands certainly does prevent them from Bensching, and they are obligated to wash them before Bensching.