"Just let me know," he says — not really caring either way, it could be the next day, or next week. He'd come along regardless.

At the warning, Law's only response is to lift his eyebrow: he's clearly well-used to danger by now. Most of what he's done in the past two years has been nothing but deliberately putting himself in danger. What's some more of that?

But there's an undercurrent to Cora's words, something he can recognize, and so he blurts out, voice tight,

"Do anything unnecessary," by which he means, try and protect me instead of looking after yourself, "and I won't hesitate to switch you with something or someone else."

By which he means, you put yourself in danger because of me and I'll switch our places around, just fucking try me.