[Dar'tanian]

You know how sometimes when you try to enter the third cloak wood you get waylaid by to wyverns and some spiders?? Well it happened to me while i had Coran so i brought both heads back to the Mayor of Beregost and he took only one of them off my hands. Does this mean i did Corans task or do i still have to kill the "Mother Wyvern"????