Rick, Daryl and Oscar make it into a generator room just ahead of a horde of undead. While Daryl holds the door shut, Rick's trying to shut the roaring generators down when suddenly Andrew, the Littlest Inmate, comes out of nowhere swinging an axe at Rick's head. Don't ask me how he got out of that tiny, walker-packed courtyard Rick locked him into, but here he is. He nearly brains Rick and knocks down Oscar and Rick is stuck fighting with him while Daryl fights the increasingly losing battle to keep the door shut against the zombies. Rick's down, having lost his gun and Andrew's about to deliver the coup de grace when he suddenly catches a trash bin in the head instead -- hurled by Oscar. Who then picks up the gun Rick dropped in the fight and aims at both of them. Andrew tells Oscar, "Shoot him!" Oscar takes his time, but after a moment he turns the gun on Andrew and takes him down with a headshot instead. And then, oblivious to Daryl (who gave up on the door and shot what turned out to be the single walker behind it during the melee) slowly sneaking up on him from his blind side, Oscar smoothly rotates the gun in his hand and hands it to Rick, butt-first. Rick throws the switches to silence the generators and says, "Let's go." Watch your back, Oscar; you're the black guy now.