In his Meshivas Nefesh on Shemos chapter 3, Rabbi Yochanan Luria has a lengthy piece on various topics related to Bris Milah. One short paragraph aims to give a little clarity to a mysterious tale in the Torah, when Moshe and Zipporah are on their way to Egypt shortly after the burning bush story, and something happens and someone almost dies, and the tragedy is averted when Zipporah circumcises her son. One of the common interpretations of the story is that Moshe almost died, having been mostly consumed by an angel (or angels) in a serpent-like fashion. Zipporah says two...