Yeah. I think that's how it works. Apparently, Allura's able to do it, too. I think it has to do with her quintessence or something. [Keith shrugged a little. He didn't understand it more than that.]
Exactly. That's why the Alteans developed a way to help replenish the energy when they would take a crystal. However, the Galra didn't do that, and they almost killed one off as a result. There might be others that they did actually kill off that we didn't know about, but we were able to save one from them before it died.
[Nope... he was just... going to keep explaining until Trowa seemed satisfied with understanding.]