goal of the game: undo the soulforging
This will hopefully happen at the end of the game. So if you continue playing the DK will not be theire. => (If the DK is free, I think he's not willing to be with you one second longer) this also means that you have a huge tactical disadvantage => whole game with a very powerfull DK and after the end alone. thats basiclly loosing half your strenght. => so the battlefields will be a bit hard.
(Ok ih the DK falls inlove with the hero it would mean that it keeps with you after the doulforging is undone, but it seems unlickly)
But thats MHO. <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> <img src="/ubbthreads/images/graemlins/alien.gif" alt="" />