The shamen is ........
Working for the devil!
At first - Part of me feels he was a confidence trickster after money and planted the crow and then got involved in something he couldn't handle and When he gets spooked he prays to Buddha which at first makes it seem like he is a small fish in a big pond.
But then his 'ritual' goes wrong(which also messed up and weakens the 'Japanese man devil' momentarily we know this because he looks for the man in the van he is trying to resurrect as Japanese devil and he also stops him attacking the mob and he is scared of the mob as he is now the old man he used to be. the dad gets his girl back but then runs over the (now) Japanese man and leaves him for dead (allowing the devil to control the japanese man fully) it cuts to the shamen he is happy and says "the fool has taken the bait" - which allows his daughter to be repossed - we know this as her appetite goes crazy again. The nail in the coffin is the camera and photos at the end - cohorts.