There's the sudden arrival of a particular lady. These are her chambers, so she's not about to knock, no matter what.

As terrible as it sounds, she's disappointed not to have caught them in something that could've brought about a loud expression of shock. It was a hope, and a bit of a set up, but none of this shows on her face.

And she's already got a reason for appearing. "Arthur, your father is looking for you." Actually, Morgana put the bug in his ear about Arthur being given more responsibility, as a way of distracting the prince from his recent 'enchantment.'

There's a hope to make ruling appear so unappealing that Arthur will choose to elope with Gwen.