He's drowning. He can't get in any air. He can't breathe. Water coming from nowhere is filling up the room and his lungs and he's going to drown. Panic is far out the door. He's about to die, he's dying, he's going to die, right here.

Which means somewhere down there, Morgana's probably already dead. He almost feels like he can feel her touch on his face or hear her voice. But she's dead, she has to be.

The thought feels much worse than the thought of his own upcoming death.