Elisto had to thank his years of combat experience combined with that which he learned when he joined SAINT. When he heard the initial fire, he turned in the direction it came from and rolled out of the way, though he did think that something probably grazed the back of his clothing. That wasn't intended to kill... he muttered as he laid there crouched, his left hand now holding his pistol while the right still held the extinguisher. My back was exposed, damned rookie mistake, he cursed silently to himself and looked around the room before moving himself over to a nearby wall, even though said wall left him rather exposed, he wasn't interested in finding cover - because he knew if he exposed himself he could potentially get the intruder to likewise do the time. Yea, I'll suffer an injury or to, but my job isn't to survive and let the guy flee but to capture him at all costs, he glanced about the area.
"Computer, seal off the medbay, alert the Taii that our intruder is here," he said to the ships main computer, he didn't know if it had a name.
As he stayed there crouched and scanned the area of the room with a careful eye, looking for any movement and ready to respond to it, he felt his hunch was correct - the fire itself was a diversion, a diversion to get him out in the open to possibly kill him or perhaps even suppress him. Sorry, but your in my play field now, he thought with a small grin.
His back was up against a wall but he still had a good view of the area, but before he could do anything he looked over at nearby maintenance conduit and kept one eye on that and another on his general surroundings.