User blog comment:ImperiexSeed/Castiel's shifting of Sam's mental problems made no sense!/@comment-3045936-20120402044434

Soulchanneling is an accurate guess. While no one can break a soul apart, like destroying or removing a part with it going to someone else. I feel that Castiel absorb all the damage done to Sams soul into his one ethereal/spiritual body. And since he absorbed it and didn't break it from him. It doesn't break the series lore than no one can break a soul to not existing. After all in the series Souls are pure energy and energy cannot be created or destroyed or rechanneled. So Castiel simply rechannel all energy from the Sams soul into himself.