Although it took me a while to complete his quest, Coran didn't give me any problems. I kept running into those wyverns at Cloakwood (the ones that ambush you that is) and never thought to pick up a head thinking "It's got to be a particular place somewhere." So, after going to their cave and heading (no pun intended) back to the temple, all was well. He never complained after that. Then again, he was too busy getting smacked around the head with blunt instruments for complaints! That'll learn him.
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Making running away an art form