Hi Bryan,
The animation controller is being played back through a script in the scene. If you right click on the scene thumbnail in the scene manager and choose "Edit Script Events", you'll see scripts for OnOnline and OnSceneOnline. These scripts control the animation controller execution.
The OnOnline script gets run when this particular scene goes online. In the example above the purpose of the OnOnline script is to see if the lower bar is already onair. If it is, then it will make sure the scene starts which the yellow or purple box already in the shifted up position.
The OnSceneOnline script gets executed whenever this scene is on-air and a new scene is coming on air. The example uses this event to check for the Red Bar (or any other scene that will be on Layer 4) to be coming on-air. If it detects a scene on layer 4 going on air, then it will play a prebuilt animation controller in the scene that will shift the objects up.
Oh, and there would also be an OnSceneOffline script to check if the red bar is going offline, and if so then it will play the animation controller backwards to shift the objects down again.
#XPression