>>281214881
Nah, I think this reaction is reasonable. He senses something really bad there. More importantly, his reaction isn't over the top. He didn't scream nor back-off. He broke into a cold sweat, but stood his ground. On top of that, on the next page he even tries to protect Yayoi by quickly telling her to drop the doll.
>>281214924
You can find it on comick. Ch 51.5