Rain's technique was a calculated fusion of his recent training and the skill known as Perfect Guard. Although Rain couldn't physically move at the incredible speed required to individually block hundreds of attacks in a single second, he improvised a solution by strategically positioning his arms to intercept the incoming barrage.
Perfect Guard, a skill honed through rigorous practice, allowed him to pinpoint the trajectory of most attacks he could see and block them with a punch, optimizing his defensive stance. However, the sheer volume of the assault took its toll on Rain. As the mana-infused spears collided with his arms, a burst of minor explosions occurred, signaling the dispersal of the magical energy. The pressure of the impact pushed him backward. That being said, his arms bore the brunt of the damage.