"Stop it." He manages to say it firmly rather than sharply, but it's a near thing. If he's calm it's because he feels like he has to be, and the fact that she's teetering on the edge of it isn't making things any easier.

"It'll be fine. And... and if it's not, Lily'll be here and she'll know what to do." When he had met her briefly she had seemed utterly competent, and right now that's what he's clinging to.

Because he doesn't feel even in the same country as competent right now.