What you should realize is that this is just inside the door from the garage. That's the garage where we saw all that pandemonium and chaos. Remember how they mobbed Ruby and herded him into the building in a wild frenzy? This is just on the other side of the door.
So, how could it turn into this, where he's all docile and pacified and hardly even noticed as he's led by Oswald? It doesn't follow from what we saw. That was showcasing, but so is this. This is the first sighting of Ruby after he disappeared into the pile of men in the garage, but it does not make sense.