straw

In honor of Rabbi Shalom
Berakhot 2:2 The Gamma brings opinions regarding the time of the Kash R. A., the holy day on the eve of Shabbat, Rabbi Hanina Mishani enters to eat a meal of salt. The Gamma explains that it is certainly the time of the Ani after the Kohen and explains that the Rashba explains that the time of the R. A. is the beginning of sunset and then the R. A. and then the R. Y. Therefore, it is impossible to say that Rabbi Hanina before the R. A., the one who is called, needs a night.
And I got stuck, apparently from the beginning of the sunset, there are several stages, and maybe after the time of the RA, between the sunsets or a little after the sanctification of the day, but where after the priest?
thanks
PS Sorry if I took too long.