Who is the Real Beast (Part 5)

The Grey Wolf couldn't fight in these conditions. Each attempt he saw to get closer to this female cultivator was cut off with either a lightning strike or a fireball. And after dodging so many attacks at once, the blinding flashes caused Riku to be delirious and dizzy to the point of nearly being incapacitated.

A sudden beam of golden light shot past Riku like an arrow; this light redirected the lightning strike that was aimed at Riku's head and exploded a nearby tree into ashes. From the depths of the forest, was Du Fu, who had activated his “Spear of Heavenly Sages Technique.”

What…? Riku questioned, as he started to faint from overexertion.

Hey Riku! called a small, yet innocent voice from the shadows. When we get older, let's make a promise!

What are you talking about? asked Riku's past self, clearly skeptical. We're already old enough to make our decisions!

No way! This decision is different, I promise!

What is it?