In that case, you will want to have someone to share watches with you.

[And "luckily" for Roy, Vulpes happens to need someone for just that purpose as well! It's difficult to know who can be trusted around this place, but he has known enemies... sleeping outside alone isn't in Vulpes' best interest and he's well aware of it.]

And I suppose you'll need help finishing this shelter before nightfall.

[The legionary stands by after speaking, waiting for Roy to dare protest.]