If you were a demon, you'd scream too if you saw an angel in all it's glory.
Poor Stolas got a good look at Michael the Archangel. (Refer to Miraak in Skyrim: Dragonborn for how Michael would sound) [This is a reference to S1E6 of Helluva Boss] Music: https://www.youtube.com/watch?v=Z4KdCyerfbE