My speculation is that when the ritual 'Gut' is interrupted by Jang-Gu (the father) the Shaman we all see is sinned for calling evil spirit upon him. Since the ritual was left unfinished, he was not able to cleanse himself back to purity. Therefore, he himself may not know he's half-possessed and half himself. It becomes clearer when the crow comes when Buddha's protection was doubted (as the candles didn't stay lit). He was just a pawn all along in between the competition of the 'women in white' and the Japanese demon. I hope it answers your question! This was all my speculation though. As the himself director had intended the film to be an open ending, so this is just my analysis for this scene :)
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