Eren had grasped the fundamentals of marksmanship pretty quickly. Perhaps his eyes were just better than most, coupled with training of practically all the useful muscles in the body, but in the time he’d spent in the city, he’d long since become adept with everything he could engage himself in--combat included.
It wasn’t like he was particularly inexperienced with firearms--they had them back behind the Walls, but they were never put to use. However, in a city that had humans as the enemy--or monsters in the shape of humans, whatever you’d prefer--he had to learn how to fight against humans.
Responsibility as a soldier would lead him to fight in the streets, protecting those he could in any way he was capable, but every soldier runs out of juice at some point. In Eren’s case, it wasn’t a lack of fuel for his own body, but rather the ammunition for the pistol he had taken as a sidearm. It slipped out of his hands, and though he had been retreating into a back alley, it seemed that another person--a pretty formal-looking girl--had been placed in a similar situation to him.
With a quick glance, however, it seemed she was in a worse situation than he was. Was that a knife? Perhaps a sword? He saw a glint of metal, but didn’t dwell on it. Instead, he inched behind her, his back facing her own. There was little else to do but--
“Haven’t a clue as to who you are, but if you can use that thing, you better be damned good at it. Just make sure they can’t get near me within five seconds, and make sure you’re close when that’s up, you hear?”
In a voice that was firm and direct, Eren begrudgingly relied on another person for backup, despite his inward refusal to get tied down to anyone. The situation called for it, and there was nothing he could do about it but make sure he cleared out the scum surrounding the both of them cleanly and quickly.