The conversation was already so nonsensical from the beginning because Senku couldn't have imagined someone asking him why he wasn't singing to whatever he was creating.

Fortunately, he's intuitive enough to realize they're not from the same world, but he still looks confused.

"I'm...not clear what singing does in this scenario. How does elven rope differ from, uh, non-elven rope?" Senku asked, because that seemed maybe the more pertinent question.