On this quest you "sneak" into saurok territory and speak with 3 mages inside their bubbles that make you invisible for the saurok. I´m horde, not sure if its different for alliance. Magister sarien is inside a cave.
Once you leave his protecting bubble the group of saurok attack you. But if you step out of the bubble for a moment, wait for them to aggro since you cant transform into a saurok to make them neutral for you in time, just step back into the bubble and the saurok disappear. Now you can step out of the bubble, transform and continue on your way. Saving you abit time if you dont want to fight the group.