Expecting Sato to be forthcoming is as fruitful as herding cats. In fact, at this point Rey doesn't expect much truth to come out of him.

Before she can tell him what a terrible idea it is to get handsy with a local created in a hellscape, it's already enveloped Sato's arm. Rather than asking if he's all right or taking immediate action, her brows just lift in dull surprise at the scene in front of her.

Once she sees it trying to literally consume him, she withdraws a ten-inch knife, sheathed at the side of her boot. She moves forward, taking a clean swing at Sato's disabled arm. Severing it from his shoulder before the bandages could snake up any farther.