Explanation #1: [Of his] refers to Rav Yehudah, who was in front of [Rav Huna at the time]. Rashi explained that [Rav Yehudah's] eyes were unusual. He did not specify how they were unusual.

Explanation #2 (R. Tam): Rav Yehudah was tallest of his generation, like it says in Nidah (24b), and Rav Huna was short, like it says in Megilah (27b), and therefore his eyes were not noticeably so much smaller than those of Stam people;

However, they were noticeably [much smaller] than those of Rav Yehudah, which were very big. Therefore, Rav Yehudah was upset;

The Shinuy is that one is big and one is small.

Implied question: This is not a Mum to disqualify Avodah until one is as big as of a calf, or as small as of a goose (40b)!

Answer: In any case he is unlike other descendants of Aharon.

Explanation (Rashi): They were round, like Terutah, regarding the moon (Sanhedrin 42a. Our text there says like a Nafya (sifter));

Rashi explained that Tzinariyos are rounder than Terutos.

Question #1: Since the Tana taught minor (roundness, that it is a Mum), all the more so severe (roundness is a Mum)!

Question #2: Similarly, it is difficult that he taught "tears flow, Dolfos, and Tordos - Dolfos is more than flowing, and Tordos is more than Dolfos!

Answer: Perhaps he needed to teach all of them, to teach that they are not disqualified due to a Mum, rather, because he is unlike other descendants of Aharon.

Explanation #1 (Rashi): It is the way of a Chacham to be modest in eating and drinking.

Implied question: It says in Pesachim (86b) that Rav Huna brei d'Rav Nasan drank a cup in two times (he paused one in the middle), and did not turn his face away. [He] said there that the Mishnah says that a Kalah [turns away, but men do not].

Inference: It is normal to drink in front of many people without turning his face away!

Answer: That is at the time of a meal, similar to a Kalah.

Citation: In Hilchos Derech Eretz we say that amidst Rabim, he turns his face to another side and drinks water.

Inference: It mentioned water, for not everyone drinks water, only one who is thirsty. However, other matters it is common to drink together [so he need not turn away].

Explanation #2 (R. Tam): Here it means that even those who are modest and do not drink in front of Rabim, one should not be modest not to urinate [in front of them], lest he delay and be endangered [to become sterile].

Question: How could they make themselves like an animal regarding urinating? They needed to leave the Machaneh and distance three Parsa'os (about 12 kilometers), like it says in Yoma (75b) that we do not defecate to the side [of Machaneh Yisrael] or in front, only to the back;

Note: Machaneh Yisrael was a square of side three Parsa'os. For those who were in front, they needed to go three Parsa'os.

And this is even for urinating, for in Brachos (25a) we establish "v'Yad Tihyeh Lecha mi'Chutz la'Machaneh v'Yatzasah..." to discuss urinating! (Eizehu Mekoman brings several answers to this.)

Explanation #1 (Rashi): You will not be barren when you pray for children.

Explanation #2: It seems that we discuss all Tefilah, like it says "the world exists only [in the merit of] one who makes himself like an animal, like it says "Adam u'Vehemah Toshi'a Hash-m", and [in the merit of] one who makes himself as if he does not exist, like it says "Toleh Eretz Al Blimah" (Chulin 89a).

Explanation: These stringencies are only in Bavel, like it says the reason, because the inclines of Bavel return water to Eitam on the Peras (Euphrates) river;

The water of Bavel flows to Ein Eitam, for the Peras mixes with all waters of the world, like it says below (55a) "one who vows from water of the Peras, he is forbidden all waters in the world";

And even elevated springs (higher than the Peras), we say below (55b) "they are [fed from underground] ladders of the Peras."

Also in Sukah (53a), we say "we dig a little and water comes out" - these are ladders of the Peras.

Implied question: Since the ladders of the Peras mix with all waters of the world, we should forbid [urinating in a urinal or on a hard place] in all waters in the world!

Answer: We forbid only in Bavel, like I explained, because the water of the Peras mixes with Ein Eitam.

Question: Here it connotes that the Peras flows from Bavel to Eretz Yisrael. However, I asked someone from Eretz Yisrael, and he said that it descends from Eretz Yisrael to Bavel!

Strengthening of question: And so it is proven below (55b). We say that the Peras is a great witness of rain in Eretz Yisrael. Also Rashi explained so.

Poor Answer: It is difficult to say that even though the Peras flows from Bavel to Eretz Yisrael, it is recognized when the river increases due to much rain, and the river increases backwards (upstream) due to the increase of water (downstream).

Explanation: Even if she does not expose herself, it is brazen to urinate when the baby is in front of her.

Source: A woman does not normally expose herself in front, not to urinate and not to defecate, like is proven in Brachos (23b, and even so we forbid in front of a baby).

Inference: Hadrokan and Yerakon are two kinds [of illnesses].

Retraction: It seems that they are the same matter, for we say in Yevamos (60b) that they passed [captive girls taken from Midyan] in front of the Tzitz. Any girl proper (old enough) for Bi'ah, her face Morikos (turned yellow - the root of this word is Yerakon), for it was said that a Siman of Aveirah is Hadrokan.