She's halfway steeling herself for something sarcastic in reply, and part of her wishes he'd just be a jerk so she doesn't have to say it. It was so obvious at home--people die, people need to be stabbed before they become walkers--that it's something nobody ever needed to voice. It was what you did. But he's not a jerk, and she has to say it.

"If I die," she says, keeping her voice low and even--the last thing anybody needs is for her to freak out the soldiers in the mess, "somebody needs to stab me in the head."

Can you do that for me? is on her tongue, but it seems like a bad idea to say it like a favor she needs from him. Even if that's exactly what it is.