It sounds like the first container actually sends the (spin, right?) info and the second "updates" the other entangled particle and the teleported one.The gas now emits photons (light particles) containing quantum information. The light is sent on to the other gas container and the quantum information is now read from the light and registered by a detector. The signal from the detector is sent back to the first container and the direction of the atoms’ electrons are adjusted in relation to the signal. This completes the teleportation from the second to the first container.