human
Subaru:  There was a crash and a spout of water. Then a powerful current spun his body around. He’d just managed to land feetfirst in the water, minimizing the impact on them, but it was still a hard landing, and with Subaru’s HP already flashing red, it was hard to shake the feeling that he was just barely hanging on through sheer determination.
gpt
Subaru:  "Gahgh." His whole body was being thoroughly rinsed and scoured by water, like a towel in a washing machine. I need to get to the surface and breathe. But I can’t move. Even if he tried to kick his way up, he had something important in his arms, so he couldn’t make it. The powerful current kept crashing into him, but he could still feel the object of his affection in his arms and the object of his hatred on his back. Neither the whip he had tied around himself nor his arms were going to let go.
human
Subaru:  "Gagh." Water entered his nose and mouth, and it felt like it was getting in his eyes and ears, too. He moved his arms and legs in vain, struggling as he was carried down the throat of the massive creature that was the river. But if they reached the point where all this water emptied out of the river, there would be no hope of survival. He had to do something before that happened.