question About the escaped imp quest (spoiler)

[Misery]

I was wondering what would happen in this quest if

1.You tell the imp to go to Debir

2.You don't hand over the imp to that demon and start the fight

I forgot to save before this, so I couldn't go back to check Would those choices yield a better reward or would it make you fail the quest ?(This one quest reminds me of a certain annoying quest in KBTL which you have to go to Ultrax,in which if you talked to the quest giver before you got the quest item it will fail)