From beyond the tiny, narrow gap ahead of him that he didn't register in the pitch-darkness, a sudden blinding flash of light prompts his pupils to retreat into themselves: a winking beacon in the nothingness. Morse? Is he dead? All this nonsense about seeing lights when you are dying is everywhere, but his obstinate skepticism has already been proven wrong once today, when Clarence's claims about an omniscient, incorporeal mind-reader turned out to be an actual thing. He even had a conversation with it, for god's sake.
His immediate thought is to stay put, away from the light, in case it does indeed mean giving in and accepting his death, until he senses something ahead: a heartbeat. A presence. Under the immense weight of earth pressing in on him from all sides, there is barely room for him to move his tail, let alone take a proper breath, but, emboldened by the presence that is surely Clarence, he wags the tip of his trapped right arm, eking out a meager expansion of the narrow gap ahead of him.
"I cannae breathe... I cannae breathe," he gibbers, still lost in panic, having yet to register that he is in fact now capable of breathing, if shallowly, through that narrow gap. Fist-sized tears moisten the earth surrounding his face, dirt particles sticking to the wet bottom halves of his sockets and the streaks down his cheeks like dark freckles against his deathly pallor. Last time, the only time, he cried like this was during his transformation, but there was no one to see it then, thank god, no one to hear it. Not like now. "I... Don't go anywhere..."
Extending an arm as far as he is able through the gap, he reaches pleadingly for his companion, hoping for another tangible, physical confirmation that he is not planning on going anywhere until he is in the clear.