Spitting at the High Priest on Yom Kippur

Question

My question might sound a little complicated, but it actually boils down to something very simple: does anybody know of any references to a kohen gadol (a high priest) performing the procedure of chalitzah on Yom Kippur itself? My reasons for thinking that such a thing might be thought to have occurred are as follows:

The Mishna (Yevamot 6:4) mentions that if a brother of the kohen gadol should die, leaving no offspring, the kohen gadol should submit to chalitzah rather than yibum. According to Tosafot (Yevamot 61a, s.v. kohen gadol shemet achiv), the reason that the Mishna tells us this is because we might otherwise have thought chalitzah an impermissible degradation of the kohen gadol, given that it necessitates a woman spitting at him. This is also the interpretation of Tosafot Yom-Tov and Tiferet Yisrael.

The Mishna (Yevamot 9:2) also mentions a variety of situations in which a woman is prohibited to both her husband and her husband's brother. One of those is when she is a widow, her husband is the kohen gadol and her husband's brother is also the kohel gadol. As Tosafot Yom-Tov points out, this must be referring to a situation in which the high priest's brother is appointed as his potential replacement in the week leading up to Yom Kippur (cf: Yoma 1:1, Megillah 1:9).

According to Rabbeinu Tam (Tosafot, Ketubot 58a, s.v. va'afilu kulan bifnei haba'al), a shomeret yavam is already like the deceased husband's brother's wife, and technically even allowed to consume terumah if he is a kohen. The Mishna forbids such consumption (Yevamot 7:4, Ketubot 5:3), but by rabbinic enactment only. Mid'orayta, she is like his wife until he either cements the relationship with yibum or terminates it with chalitzah. Since the gemara learns out from Leviticus 16:6 that a kohen gadol can only have one wife while he is fulfilling his duties on Yom Kippur, then Rabbeinu Tam's conception of yibum is such that if one of the two brothers dies on Yom Kippur itself, the only way that the other might officiate is if he first performs chalitzah.

I would like to know:

1. Does anybody know of any sources that discuss the performance of chalitzah on Yom Kippur (the visual of a high priest on the holiest day being spat at is quite striking, and adds to other imagery relating to the decline of the priesthood);
2. Does anybody know of any prohibition of performing chalitzah on Yom Kippur (or any Shabbat), and whether or not there was a problem with the high priest "technically" having more than one wife on the day?

Answer 1

Rabbeinu Tam (who technically allows her to eat Terumah) is talking about a Shomeres L'bias Heter (at least MedRabanan (see Rambam Hil. Terumah end of Chap. 7)), but in the case of the KG she is Shomeres L'bias Issur Shel Torah and does not eat Terumah (Rambam ibid 7:21). We do not find that RT holds that Zeikas Yovom that is Ossur Min Hatorah is considered his wife and eats Terumah. Also see Mishna and Rashi Yevomos 56b.

In general, Shulchan Aruch Orach Chayim 339:4 it says Chalitzah can not be done on Shabbos, and in 524:1 it says it can not be done on Yom Tov. Also keep in mind that he has to wear a shoe to do Chalitzah and the type of shoe for Chalitza is one that can not be worn on Yom Kippur (see Yevomos 202b).