[Merlin looks up at that tone, as sharp as Arthur's at his angriest. But he watches Nathan press a hand to his forehead and he's back to rummaging. He holds a bottle up and shakes it gently.]

Here, take a couple of these. Gaius used to make a tincture of willow bark for me, but these are a lot easier to swallow. [Merlin sighs and settles back on his heels, thinking about his own experience with the walls.] I keep passing the same terrible painting, no matter how much I try to get away from it. But how is that even possible?