After he's finally able to retrieve some information left behind by the Tågevalgten, Marco thinks on it for a few minutes before deciding to ask Elias for some clarification. Casually, and harmlessly! He means nothing by it, really!

It's just... He swears he can remember being told something distinctly different back when he became a priest, so... Is this information wrong, and the Fog God IS indeed responsible for the destruction of Skämd? Or is he misremembering? It wouldn't surprise him if he's misremembering... Elias knows Marco was already unwell at the time, doesn't he? So that would explain it.