According to Osho, Tokusan's encounter with Ryutan signifies the collapse of second-hand, scholarly Zen and the birth of direct, lived Zen. A master cannot "teach" Zen; his presence radiates it. By dropping study and opening vulnerably to Ryutan, Tokusan shifts from head to heart, from doctrines to immediacy, catching Zen like a fragrance, through proximity, silence, and surrender.
You don't get Zen from books; by relaxing and being close to a living master like Ryutan, it rubs off on you.