I'm going to have to count on you. I can only attack once every few minutes. [So she's going to be on standby until something demands her attention.]

Since you'll be fighting on the way over, I'll take first shift working on the station. You're probably going to be tired, or, at the very least, in need of rest for your shift.

[And that's the second reason she's coming: to ensure that he gets some rest.]

That is not negotiable.