Yes. The sane parts are no less sane, the unstable parts no less unstable. It is merely that one has not overtaken the other as of yet. A constant state of flux, or a triggered state of disillusion, if you will.

[Ben reaches for the stairwell door, distracted from her for a moment while he scans the deck as he leads the way out onto it, hesitating just before stepping through the threshold. It's such a small hesitation, a mere slowing before he's stepping forward again, sidling out of her way so she can join him.]

Unless you needed it as a mercy in some way, he does not sound like much of a friend.