I'm currently doing this quest, already escorted the group of slaves to the tunnel (mine) and my problem is that the mission doesn't get accomplished and the main slave stays in the hero's party. I might have figured out what to do, if I had an entry in the questlog about this particular task given by Vasco, but all I have is what the hero told the slaves, so could anyone who finished the mission please tell me what to do with the main slave?