Bucky had spent the morning helping "inventory" supplies for some of the refugees. Mostly, he'd been moving boxes from one end of the "room" -- little more than what remained of a corridor that had mostly collapsed -- to the other while a girl with a broken clipboard made notations she wouldn't let Bucky see. It wasn't like he didn't understand the suspicion. He would have been suspicious, too, if random people just showed up and effected a prison break. Her leaders had accepted them into the base. Anything else had to be earned and John was the one who could speak their language best, not Bucky even with all his experience with war and poverty himself.
Still, he wasn't one to sit idle. So, when Steve didn't need him and Bucky wasn't checking up on those members of their team that had the dubious honor of being adopted as one of his 'strays', he volunteered his services where he could. It wasn't like hard labor was something new to him, either. If he could help these people fortify this base, he would.
It was as he was on his way to find Steve after that he came across Mac. A week's worth of training was hardly enough to get to know a person and, like Bucky, she didn't seem to be one to put herself out there with a lot of people, so they hadn't really talked. But, seeing as she seemed to be wandering the corridor looking like a puppy left on the side of the highway with no idea how to get home, he changed course to intercept her instead of continuing along the cross-corridor he was currently taking.
"You busy right now?" he asked as he came alongside Mac. "I could use a hand down the corridor with the dinosaur sign on it." Bucky still didn't know what half the mangled signs on the walls had meant before the theme park had been destroyed. But, he assumed they had something to do with the attractions.