River.

[Erik's genuine pleasure at seeing you, please marvel at it. It sort of makes him look his own age, and not ...ten thousand, in stress years.]

There are deer, then. Useful. [He files away the new information singular to River, which gets its own significance. What he interprets - correctly - as a small but extraordinary kindness earns a separate but no less genuine smile. This may be the point where River learns he can make that expression without looking like a shark full of chum.]

Now you have only to find tea. [A beat.] That crash you just heard may have been Charles falling down the stairs in his haste to get to you.

[There was no crash, Erik is just a fucking troll.]