Ronan's omniscience, such as it is, doesn't manifest in ways that are nearly so convenient. He's alerted that there's someone at the door when he... hears a knock at the door. Lying on the sitting room floor surrounded by a nest of esoteric Latin literature, he'd been about halfway to dozing when the sound stirs him back to waking.

Visitors are rarely there for Ronan, so he doesn't bother to get up. Instead he shouts, "It's open!" and shuts his eyes again, striking a funereal pose with his hands clasped over his chest.