[Lava]

Yeah, because they sent you somewhere else.

They told you:
~What?! I am a cook, not a thief! Shouldn't you check the Copper Coronet? It is where most thugs go. I... work in the kitchen there. I just cook, but I know what kind of people frequent the place.~

So you should have checked that by going to Copper Coronet and talk to the cook to confirm if someone like that is working there.

Since you just attacked them, the variable wasn't set, thus you got stuck. 

It's best if you load your game and continue from before you attacked them. If that is impossible, you should set that variable to 14. 

C:SetGlobal("L#2WalahnanQuest","GLOBAL",14)

And, huh... I thought presumption of innocence is still a thing...