"That brat's power is terrifyingly strong..." With his lightning cloak crackling and his hair standing on end, the Fourth Raikage blasted his way out of the wreckage and stared at Naruto's figure from afar with a solemn expression. "Unbelievable. To think this is actually just a young ninja from the Village Hidden in the Leaves."
How could the Fourth Raikage possibly know that Naruto's strength simply defied all conventional logic? Perhaps the power of Frog Kumite under ordinary Sage Mode would not have been enough to send the Fourth Raikage flying hundreds of meters with a single blow, but Naruto's Sage Mode happened to be different from anyone else's.
One must remember that the power of Senjutsu originates from the external Natural Energy. Thanks to the attribute bonus of his "Natural Energy Affinity," Naruto already possessed a special constitution attuned to Natural Energy, allowing him to draw upon far more external Natural Energy when using Senjutsu.
Chapter 45