[He nods at Yukina, reiterating without any hesitation.] Even if it means killing someone. It's a means to a preferable end, isn't it? I'd be more than willing to help you see it through, no matter what it might take.

[Yes, this is what he would be far more comfortable doing. No more sitting on his hands, then.

Light then shifts his weight to his other foot, looking at Nagasone more directly.]

I'll make sure nothing happens to her. [Often empty platitudes, when it comes to Light. However, Yukina has proved useful in every moment, up until now -- her faltering with the chainsaw was enough to illuminate a very particular character flaw, one that he could mitigate with his own guidance.] It goes without saying that we'll be careful.

In the meanwhile... you'll help us implicate Akane, won't you? Both now and after your death.

[Meaning, they'll be using your body, Nagasone. Straight to the point.]