It adds an ironic aspect that was not at all present in this episode, and I think the book’s style was simply superior.

What’s angering me there is how this change makes the whole scene more sinister. In the source this was an important moment of calm that broke up all the looming dread and malice around Rozemyne. In the anime we see them being abducted and separated from the others which negates the intended “here, let’s have a relaxing and magical moment for MC mental wellbeing”. It’s just another instance of fucking WIT studio not understanding the source material.