Sam was managing his arm power while also spinning his inner essence to resist the bone-chilling cold of the waterfall. He couldn't support it even if he had the 'True Primal Chaos Formula' on his side!
His arms began to shiver, and blue veins started to stick out his forearms clearly.
After half an incense stick of time, there was a dull thumping sound as Penetrating Rainbow's spear point struck the rock. The endless waterfall finally pushed it down.
Sam knelt on the rock, gasping for air in large gulps. He felt as if both of his lifeless arms were no longer his. He attempted to stand but discovered that his true essence had been mostly devoured.
"Splash!"
The waterfall was rushing down the rock and swept him off. He raised his spear and stabbed the rock, steadying his body in the water.