He's held onto and Rean's fine no matter how tight he clings. He pets his back, slow soothing circles. Calming. Safe. The landscape may be pretty bleak but even the howling winds seem to die for now, letting Dusk's screams be muffled into Rean's shoulder or tossed to the emptiness, but either way he's not letting go of Dusk for now.
Re: Dusk
"You're all right. You're safe."