At this point, it was clear to Kazuya that his virtual family wasn't real, and that this sudden act of hatred from what seemed to be his wife towards him only confirmed it. Nothing in the game was real, but it was only programmed to emulate reality.
The half-eaten person confidently lunged at Kazuya, wanting to tear him into pieces with its bare hands. Perhaps it thought Kazuya would never raise his hand against her, given his love for her.
But to its surprise, he raised his hand, and with the trophied power of Sarasa, a large sword appeared in his hand, and with that weapon, he decapitated the creature.
Its head rolled several times in the air with a surprised look on its face before it began eviscerating into ashes along with the rest of its body.