Savin does not notice anyone special other than Femfrys who started the ceremony and immediately left. Shan Thar leads the singing and praying and the grey robe man stands next to Shan Thar, reeking of alcohol.
When Savin asks Shan Thar how long the fasting it, the priest replies "This is not fasting as you were fed. The cleansing process last 3 days. Feel free to leave if you are not worthy of Mystra."