The place Kent arrived in was the realm he wished for.
The realm crystal had taken his wish, which in this case was the Soul Realm. He wished for that type of realm.
The rest would be based on how the crystal worked. Kent wouldn't know where he would appear or how the realm would look and behave.
That was completely random, so he was taken aback when he appeared, hovering in the air over a large expanse of river.
However, his soul also felt at peace in that very moment. Perhaps that was how it was meant to be or what he wanted to feel.
But that tranquility didn't last for long when he felt a sudden pressure fall on his soul. It wasn't a physical push; it felt more like a powerful force pressing against his soul.
Then he lost his balance and plunged into the depths of the river, sinking to the bottom instantly. The pull of or push on his soul was so powerful that he had no control over his own body.
Then the name of the Realm was spoken.