He says,

"It's okay." Softly at first. Then, closer to normal volume, lifting his head: "It's okay. I'm okay."

Maybe he means, it's okay, don't worry. Or I'm okay, despite everything. Or, it's okay even if what the spirit said is true. It's okay, at least, right now, because it has to be. They're still trapped in this place. Another spirit could attack them at any time.

So he pulls away, moves to straighten back to standing.