"There's a reason why I singled him out as the person to help, even though I know that you carry a greater amount of spiritual power," Rukia points out, tilting her head gently, hoping not to offend Castiel in the process. She readies the water, setting it to a boil and warming the cups so that they can best receive the tea. "I know that things are different in your system, and perhaps different in the greater world that you live in. But the practice which my kind keeps carefully to is the notion that there is a balance that must be maintained between the living and the dead. Souls cycle through the world, reborn constantly, unless otherwise interfered with. My world was put in grave danger before in the past, when malevolent spirits were simply expunged. Completely destroyed. If the world can be likened to a scale, that brought things away from their necessary balance. Dean has been through the training to manage this, and his tools are the kind that purify spirits, as opposed to ridding of them entirely."

Gray eyes flicker up to meet Castiel's gaze.

"I could try to teach you to do the same. But I want for you to go through that training first. None of us can afford to be rash, especially since Darrow is such a small, enclosed space. One where none of us truly understand all the rules at play."