Your pistol was leveled at the alien before your conscious brain had properly registered the warning or the threat, and automatic reflex ingrained by hundreds of hours in the simulators. There was a flash against your laser goggles as a momentary blue line etched itself between the aperture and your target, sending him sprawling to the floor.
Instantly, the team was up, weapons at the ready. You closed the distance quickly, stepping around the crates with pistols leveled. Doyle swept the shotgun aside with a foot, and you finally got a good look at your target. They were a reptilian-looking humanoid, with scaly, green-green skin and a shallow crest running from the top of his skull to the tip of his nose. He was emaciated and haggard-looking. Open sores and mottled patches of missing scales lined his forearms and neck, and his clothing were filthy and worn through. Embedded in each temple was a metal implant about the size of a quarter, with a small, blinking yellow light. His breathing was ragged and his eyes were screwed shut from the pain, but he was alive and conscious, for the moment.
"Recognize the species?" You asked, to a chorus of negatives. The alien just groaned.
You suddenly weren't worried about him getting back up after the ACER blast; to be honest, you were surprised he had been on his feet at all.
You took a quick glance down the hallway behind him. About 25 meters down was a large hatch in the floor, presumably access to the engineering room. You supposed you were currently on the spine of the ship, over the cargo bay. You team was around you, pistols leveled.
What do you do?