Sam was tempted. Tempted to kill. Tempted to snuff the life out of this young killers. But he didn't. He kept telling himself he would not end up the way they did. He will not resort to killing. He will stay the same. Be the same.
When he reunite with the others he will always be the Sam they know. He will always be. He did not kill or break any bones of the girl. He tied her up.
Upside down. He wonder whether there are others who will climb the third floor and blow the finishing move. He figured no one will.
He pats for their pockets. For their keys. He got exactly fifty of them. Plus himself, fifty one. More than enough to pass the elevator.