I highly suspected that the little girl had rabies. When the priest poured holy water (actually tap water), the little girl was very frightened and painful, struggling and screaming. This is exactly the same as the "hydrophobia" when rabies attacks. The expression and face are also very similar to the symptoms of rabies, but not so exaggerated. Rabies patients are also tied to the bed, and the doctor will bite when they attack, with great strength. In addition, it is said that this is based on a true story. The rabies virus was discovered in 1885 and was still being studied in 1956. This story may have happened earlier, and the clinical diagnosis technology was very limited at that time. I'm more convinced it's a virus than a demon.
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