Though it's clear that Rodolphus caught Balthier's look, there's no indication that he's taken it to heart and he doesn't apologize. He also doesn't back that far away from the railing. He listens instead, head a little tilted, gaze distant.

Something thuds against the boat, the impact distinctly more aggressive than chunks of flesh bumping against the hull — it doesn't sound damaging, the ship is pretty solid, but it does sound like something sizable.

Glancing at his companions, he weighs the consequences of what he's about to do. None of them are really in the position to act because they don't know what they're dealing with. And while he'd been conservative with the light before because he's sure it will draw a lot of attention from anything that might be down there, there's no getting around it, really.

His voice is moderate, unlike Ilde, but it undercuts the keening with its unexpectedness. "Be ready."

... a suggestion, just like the throat clearing. Rodolphus moves to the railing purposefully and points his wand. The ball of light that darts into the water without so much as a splash brightens and swells beneath the waves, illuminating its contents with a sickly glow.