I try to avoid walking around in the beginning to avoid having this task to early on.
But around lvl 9 or 10 I have to go to Old Forest and there it comes.

If I 'leave', will it pop up again?
How do I save the merchant?
Im playing a rouge.
I actually managed once, by in stealth dirty fight one of the blue thieves.
The rest including the boss came running and I managed to kill them all and the merchant was still standing alive.
Alas, this trick 'always' fails when I try it again.
The merchant is not there after I fought the bad guys in the SW corner.
I once ran up between the houses and he was standing in his usual place, but when he saw me he did
-: CHAAAARRRGE!!! towards the thieves (I bet he also used a movement infusion rune as he was almost in two moves fighting the assasin lord and got killed ofcourse).
So PLS spoil me.
How can I have a reasonable chance to finish this little annoying task with the merchant alive.