Tobirama Senju, in his Impure World Reincarnation state, cast a ninjutsu at Hashirama Senju. "Genjutsu: Bringer-of-Darkness Technique." To disrupt Hashirama Senju's immense Chakra for even an instant nearly drained Tobirama Senju dry. Even with an Impure World Reincarnation body, it merely meant that his Chakra could recover without limit. It did not mean he possessed an infinite amount of Chakra. At that moment, Hiruzen Sarutobi moved like an agile ape, leaping up the Wood Human Technique's legs and torso until he reached its head.