Board Thread:The Quarters - Q & A/@comment-109.242.189.109-20140305120051/@comment-24150802-20140307072008

The person who started the quest has the option to abort the quest. The quest scroll will go back into that person's inventory so it can be reused. The quest could then be restarted with the new party member. However you'd probably want to do this only if the quest has not progressed very far, or if the new party member will make a big difference to how quickly the quest will be completed. Or if you just like him a lot and want him to be part of it. :)