"What does this mean."

It comes out too flat, because she's making her voice not shake, making herself not shout, by sheer effort of will. Her face is white.

(The devil is a constructed personification of a moral concept, Regan knows this, and that's Nick Rosse, she's seen him at parties and even met him briefly and he's charismatic and even magnetic but that's all, except back there, his eyes...)

"For us."

By 'us' she really means 'Simon and River.'