human
Subaru:  Even though he’d resigned himself to the extreme pain that would arise, it was not pain one could endure. All the more so because this time, it was not just a right arm but a left arm that emerged with it. Perhaps the completed right arm had developed a taste for this. Before Subaru’s unmoving, wide-open eyes, the right hand slid past his rib cage and brushed against his internal organs as the left hand split off. The right hand went for his heart; the other caressed Subaru’s cheek like it was fond of him. —Terror welled within him, and the next moment, pain shot through his every nerve. He ceased to be himself. From the top of his head to the tips of his toes, he had a horrible, unendurable sense that something was wrong. His brain boiled in a tempest of negative emotions; his consciousness faded in and out. And yet, the soft touch of the palm on his cheek bore warmth that brought relief when he felt like his mind and body were about to melt. But Subaru knew a feeling of beyond that.
gpt
Subaru:  “I’m…back!” His vision was blurred. His soul had been whittled down. None of the pain and suffering had carried over to the real world. No time had passed. Rem and the demon beasts were in front of him, at each other’s throats just like before. —But the instant Subaru returned to reality, a great change came over the field of battle. Rem and the demon beasts poured all their attention onto Subaru; it was as if some anomaly had emerged then and there that could not be ignored. No doubt the cause was that, just as Subaru had planned, the witch’s stench was erupting from him.
human
Rem:  “—!” Rem roared.
gpt
Demon beasts:  The demon beasts howled in unison.
human
Subaru:  Yells at the top of his lungs. With split-second timing, he evaded the claws of the leaping demon beasts and the iron ball slamming toward him, as if his life, his very soul, had been set on fire. —And so the great melee began.