Yep its pretty awesome for 10-20.

When you enter the instance there is a grate /porticullis thing in front of you. Run the people you want to park up to it and have them stand there.

You can clear up to the butcher in that main courtyard and still be in range. When you gather mobs up and run around on the wall youll notice that you're coming back around towards your people, so even though you're up on the wall theyll still get XP (just make sure you can see them on your minimap).

Even when you get up to arugal, if you wish to go that far, if you run him out the door past where the wolves were and go to the corner of the hallway, your guys can get XP at the grate.

Pretty neat.

=)