Syl targets one of the thugs that have approached the group (Thug One). Saying a few quick mystical words, suddenly that particular thug sees a large serpent getting ready to attack him appear from nowhere (just fluff for a Cause Fear spell). "You'd better get out of here or you are snake food," Sylvain's voice is clear to the thug over the din of battle.
DC 15 Will save for partial