Disclaimer that I am not very well-versed in the Star Wars universe, so please don't hesitate to PM me if I get anything wrong along the way! As always, feedback and constructive crit is welcome.
They knew better than to ask questions, as they marched in at his command and hoisted the body up between themselves, sweeping the still form to the infirmary without a word. There was a flurry of activity and dark cloth as the medics cut it away, time seeping out through the extensive display of slashes, bruises, and unusual, deep punctures that riddled the stranger's body. Kylo could only stand and watch to the side, silent, his expression once again hidden behind the hard shield of his mask.
It wasn't long before treatment was administered, and the patient's body sequestered into one of the glowing bacta tanks in the medical bay. The room slowly grew hushed as doctors trickled away to other duties, now that the man's condition had been stabilized; and soon Kylo found himself alone with him. He could hear the sound of breathing through the respirator and the steady beep of other instruments around them.
Kylo's gaze followed the wounds across his body, old and new, and couldn't help but ponder their origin. Some appeared relatively standard- a sliver here, a scar there; though one across his chest looked particularly bad, as though some animal had slashed across it. Many of the other scars appeared strangely formed, patches of warped flesh stretched darkly over pale skin, like burns that had made a forceful impact upon contact. They certainly could have been from a blaster, but such direct hits would have instantly crippled or meant death for many life forms- especially for a human like him.
He was human, wasn't he?
Kylo dismissed the thought and took a step closer as his dark eyes fell on the fresher injuries, especially the numerous puncture wounds. Yes, they looked like bite marks from a considerably large, fanged creature. Venomous as well, if he had heard one of the medics correctly. Kylo wondered where he had gotten them from. He wondered who this stranger was, so foreign yet familiar, and how he had gotten aboard a Mega-class Star Dreadnought, past every single one of their defenses without notice. And then dropped right at his doorstep.
What are your secrets?
His gloved hand reached out unbidden towards the glass, stretching toward the man behind it, searching…
"Sir." Kylo stiffened, dropping his hand and sharply whirling on the Trooper who had approached him from the side. His mask veiled his surprise, but his voice did not hide his anger.
"What?"
The guard flinched under his suit, but steadily replied,
"We've completed the bioscan, and the man does not match any records to the personnel we have on board. Though," With both hands he presented a small, elongated object, "We did recover this from his garments, sir. It was the only possession on him we found."
Kylo scrutinized it under his helmet. It was approximately 13 inches in length, a smooth ebony tone, well-polished, with one end thicker than the other like some kind of handle. It looked like neither a weapon nor a form of intergalactic transportation. It was unremarkable, to say the least.
"That is all? It looks like...a stick." He grabbed the handle- and immediately, Kylo felt an immense surge of energy rush through his fingers and up his arm, shocking him so thoroughly that he let out an exclamation of surprise and dropped it unceremoniously the next moment. It clattered to the ground loudly.
The Trooper slowly looked down, then back up at him, followed by an uncomfortable span of silence. Neither could see the expression of shock written across both their faces, especially the red blossom of embarrassment that filled the darker one's cheeks.
"Well, what are you doing still standing there?" Kylo recovered, agitation returning to his voice, "I want it sent to the labs for analysis. Now."
"Yes, sir." The guard scrambled to retrieve it and hurried out of the room, leaving him alone once again. No- not completely alone. Kylo turned his attention back to the man who was floating oblivious in a deep, artificial sleep behind the glass. He flexed the hand that had touched the strange stick, still feeling the reverberations through his nerves. Here was yet another mystery to be added to the cloud that shrouded him. He would soon be able uncover the truth, but not yet.
He needed to seek his master's guidance first.
*the scar across Severus' chest alludes to the scene from Prisoner of Azkaban when he was scratched by werewolf-Lupin