That's not important. [Is her instinctive response, but after a few moments it occurs to her that, actually, the fact that basically everyone died is important, even if (she's pretty sure) it's going to get fixed. She's not sure what's going to happen to them, the ones who are getting overwritten. Do they get to live out in dreambubbles, or do they just disappear?]

. . . a lot of people died. [She says this part quickly.] Pretty much everyone, actually! I-- [She trails off, looking at a point beyond his shoulder. She's still not used to the sight, much less not being able to smell anything, and it bothers her.] Our mission was pretty much an unmitigated failure. That is the 'all of this' I sent John back to fix.