Since whenever the player looses turns when fighting a flesh angel (or blood sacrifice) the message "The terrifying visage of [ monster name ] paralyses you." shows up in the message log I tested if wearing a blindfold would help. The plan being to wear it before walking or shooting blindly in the general direction of the monster without getting paralysed .

While wearing a blindfold does make the character immune to the monster's special attack while it is at least a few tiles away it stops working when the player or monster moves in an adjacent tile.