Clarification?

A monastic once asked Zen Master Tozan, "Among the three bodies, which one does not fall into any category?"  Tozan replied, "I am always sharp at this concrete place."

Later, it is said that another monastic visited Zen Master Sozan and asked the not unreasonable question, "Tozan said, 'I am always sharp at this concrete place.'  What does that mean?"

Sozan said, "If you need a head, chop my head off and take it with you."

Yet another monastic is said to have asked Zen Master Seppo about this, and Seppo suddenly hit the monastic with his staff and said, "I too have been to Tozan."