During Lee's medical check-up, he discovers that there's a lot of damage in his chakra network. Guy tries to cheer him up by taking Lee to the Academy training hall.
Even using the Byakugan,
I can’t find a single footprint.
Selbst mit dem Byakugan kann ich nicht
einen einzigen Fußabdruck entdecken.
Ojo Blanco
Ojo Blanco
Neanche col Byakugan 
vedo una singola impronta.