Unsounded II: Two Wrights Can Mend A Wrong

[Morty]

Poor Chea. Her father's dead, and her mother's drunk. And her mother's new lover is now cheerfully planning treason inside their home. She looks really lonely in that last panel.

So, Yerta spoke to Bell. Is he making it up, or did he really hear something? I'm presuming the latter, since he seems confident enough in Karl not to tell him tall tales. So who did speak to him? I'm not ruling out its really being Yerta, but something tells me it's someone or something we've yet to see.