I can suggest a spot. Tell your friend to try Frebin Tinderhue in Steamfont Mountains, he's a level 25 gnome warrior on a 6 minute timer.. he's inside the middle windmill before you get to the Minotaur caves. Solo spawn and the watchman guard won't aggro from outside while killing him so it's really chill
[You must be logged in to view images. Log in or Register.] see how he likes it. He can stay there till like 28-29