The sound Lucas makes is best approximated with the following string of consonants: "Ghhwghhh."

He kind of shrinks, shielding his face instinctively with his hands after the fact and splitting his fingers to peek between them only after he's sure no more is coming. He takes a shallow breath. An accident. The boy who'd stood ahead of him during the sorting certainly doesn't seem like he wants to pummel him. Lucas straightens his glasses, then opens his mouth and tries to say something normal, "It's, um, it's p-probably not safe to get too close to the edge of the cliff."

Why on Earth did he get sorted into the cliff house.