This time, Cata knows what the doors are for.
She weighs the matter for a while, then decides she might as well. She's still a bit out of sorts from talking to that fellow who looks so much like Sam, and thinks on lines she can understand, but... isn't, in the end, her best friend. Perhaps the opportunity for a little civilised mayhem will help her clear her head.
So she takes the blue door, opting to just get a rifle there, since there will be other weapons. She can put up with wearing something other than her usual, this once.