Week two.
Ryuken taught Water Spine on a Tuesday morning in the inner sanctum, which was the same morning he told Vane that Iron Root was acceptable. Not complete. Acceptable. The distinction was the first thing Vane understood about how Ryuken measured progress, which was not against an ideal but against a functional threshold. Iron Root was acceptable when the body could transmit reliably enough for the next state to be built on top of it.
