Gamma was about to squeeze the trigger of his rivet gun when the big daddy stomped down on the ground, rattling Gamma, causing him to pull the trigger, sending a bolt into the wall. Alerted, the big sister turned to Gamma, letting out an tinnitus inducing shriek, and with a gesture, she hurled a disused wheelchair towards Gamma. He jerked back to avoid the projectile, a moment too late, and the wheelchair glanced off of Gamma's helmeted head. Gamma was knocked over by the blow, his rivet gun flying from his grip as he stumbled. Gamma landed on his side with a resounding thump, his head ringing and his vision reeling. Gamma dragged himself into a kneeling position, and stood unsteadily, his head still spinning from the blow. Gamma swung his head around, looking for the rivet gun, but instead saw the little sister unguarded, the big sister slumped over by a cosmetic clinic. The big daddy had turned its attention towards Gamma, it's drill revving.
Gamma was not ready for this fight, and while he didn't know how wounded the big sister was, he didn't like his odds against her or the little sister's protector, especially in his possible concussed state. Gamma had very few options; the big daddy stood between him and the medical pavilion, and returning to the Atlantic Express would simply trap him in the train station. The only other exit was the cosmetic clinic where the big sister was starting to pick herself up. Gamma made his decision just as the bouncer started to rush towards him. Gamma burst forward, barely avoiding being impaled by a drill, and made for the clinic doors, scooping up the little sister as he ran. While Gamma knew this would incite only further wrath from the big daddy, he didn't want to simply leave the girl, for fear that the big sister would take her, as Gamma did not know what the shrieking monster planned to do the with girl.
Gamma ran past the big sister, who was holding up her visibly shattered arm, and burst through the doors of the clinic. Gamma found himself in the midst of a group of humans dressed with strange, out of place clothes, and armed with strange, out of place weapons. And a splicer.