Extra. This is why he feared her during that time.
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As she said, what Gabriel was frightened of was because of Evangeline. Because Evangeline wasn’t in the mirror, he feared she might be a non-existent illusion. The low body temperature touching his skin, the faint but beating heart – it all felt futile. As if Evangeline had really become a corpse. It reminded him of his childhood days running with a dead child on his back.
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Another extra. Marik(Bishop with high position, the one wearing a veil) was the owner of the carriage that killed that child.

So apparently, during the practice—when they were dancing. Those eyeballs weren't from the MC, they were from pudding, the cat... From the novel:
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Lord Pudding really has such a bad personality. Those things were originally byproducts of the cat trying to expand its territory. The cat liked the young lady and tested Gabriel, who was beginning to show interest in the young lady. Because without accepting even the side the cat showed, he couldn’t handle the young lady. And the result was like this – earning the cat’s disappointment.