His eyes narrow at the sight of Ashildr - Me, whatever she's calling herself these days. His memory is a tricky thing; he's had to piece together fragments by working around what he knows is missing (Clara, in this case). But he remembers her involvement in Clara's death, her manipulations. He remembers their little escapade in the Middle Ages perfectly well, since Clara wasn't around for that at all. He's not sure how to feel about her, but he doesn't think he likes her very much right now, and he certainly doesn't trust her.

"If there are any settlements. Chances are equally good we're expected to be colonists - think of it as an interstellar Australia, perhaps." There's no way of telling which is accurate, except to set out in a randomly chosen direction and hope they encounter either someplace more hospitable or a place occupied by other sentient beings.