The bag has the stem cells in it.
The video is of the machine. where you see the card showing colors, it is the color of the blood they are looking for (you can see the tube matches the color perfectly) the goal is to have a certain percentage of red cells in that tube. My understanding of the machine is that the blood travels from Allen, through the machine, where there is a huge centrifuge, there the blood is separated into different parts. Where you see the brief flickering, there are 3 tubes 1 - white blood cells, 2 - red blood cells, 3 - stem cells (the red and white are returned to Allen, the stem cells go to the bag)

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