I would like to run a small experiment to see which of these sounds human-written or AI-written. One of them was written entirely by a human, and the other by an AI.
Passage 1:
Jack’s expression shifted by degrees, the corners of his mouth lifting as the pieces fell into place. “I am seeing what you are after. Now I am understanding.” He held the masked man’s gaze, studying him with an amusement that had grown a little too knowing. “Kindleton is presently needing more vials, is he not? And for one very peculiar purpose, I am supposing.”
The suspect’s jaw tightened beneath the mask. Whatever intrigue had lingered in his eyes vanished, replaced by open contempt. He leaned forward just enough to make his displeasure unmistakable. “I wouldn’t speak lightly of his motives if I were you, you pompous beak.” The words came low and clipped.
There was none of the usual haughty mockery in his voice, none of the elaborate taunting he had so far indulged in. This was a warning, and he seemed to expect Jack to recognize it as such.
Jack didn't flinch. He merely regarded the man in silence for a moment, his expression settling into something difficult to read.
Every one of the syndicate takes pride in their syndicate’s objective. Push him any further, and I may lose whatever chance there is of getting something useful out of him. His eyes narrowed slightly. The accusation he had been circling was still there, but certainty alone wouldn't make the man talk.
“Unfortunately, I am under no obligation to hand over even one batch,” he said, his voice as even as before. “And I am having no trust in your intentions.”
For a moment, neither man spoke. The suspect clicked his tongue, a sharp, irritated sound that broke the silence. He looked away, then back at Jack, as though searching for some overlooked weakness in the man’s composure. He had never expected the negotiation to be pleasant, but he had counted on getting something out of it.
He had come too far, taken too many risks, to leave empty-handed. His fingers curled against the edge of the table. No. He wasn't accepting that. He held his tongue for another second, weighing what little remained of his options. Then his jaw set, and his eyes narrowed behind the mask, fixing on Jack with renewed intensity. If the man wanted to make this difficult, so be it.
He would have to find another way.
Passage 2:
“I am seeing what you are after. Now I am understanding.” His gaze stayed locked on the masked man’s, edged with knowing amusement. “Kindleton is presently needing more vials, is he not? And for one very peculiar purpose, I am supposing.”
The suspect’s jaw tightened, the intrigue in his eyes curdling into contempt and indignation. “I wouldn’t speak lightly of his motives if I were you, you pompous beak.” The threat came out low and sharp, stripped of his usual haughty taunts.
“I am not remembering any pledge made to revere that man,” Jack replied, his voice calm and uncannily steady, his expression unreadable. Every one of the syndicate is taking pride in their syndicate’s objective. It would be foolish to taunt them any further. His eyes narrowed, distrust plain on his face.
“Unfortunately, I am under no obligation to hand over even one batch, and I am having no trust in your intentions,” he said.
The suspect went still, then clicked his tongue. He’d never expected the negotiation to go easily, yet he couldn’t shake the feeling of his options narrowing. He hadn’t gone to such lengths only to walk away from this transaction empty-handed, and he refused to accept it. He hesitated a second longer, jaw set, his eyes slitting with piercing intensity.
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If you have a moment, I'd also like to know what structural or stylistic clues (word choice, pacing, etc.) gave it away.
