Frisk's concern didn't fade much at Sans' explanation. She could tell he was lying. She knew him far too well. But it wasn't like him to get freaked out by something other than his own nightmares and memories. It was clearly an outside source...But what could possibly be so unnerving that even Sans is scared of it?

She jumped at the sound of the voice. She froze and looked around for the source of the voice, but of course didn't find it. It was odd...The voice sounded familiar, despite its brokeness. If she could hear it again, she might be able to pinpoint who it was.

At the sound of the laughter, and Sans' quick response to it, Frisk tensed up. She wrapped her arms around him and held him tight, shivering for a moment before realizing how weak she was acting. Without any fighting experience in this timeline, or a decent amount of HP, Frisk was certainly no fighter.

But she could refuse to be afraid.

It had been such a long time she she faced a monster she had yet to befriend, but her determination soared. "Who are you? Show yourself!" She called, still holding onto Sans as he and her determination were the only things keeping her brave.