They collided like a lightning super bolt, fast and impactful. The air shakes and distorted because of the shock.
The palm and the fist strike collided and a shockwave ripples with lightning speed in the sky, producing a sonic boom.
An explosion of energy backed by Essence ripples through the air and creating a gigantic explosion of energy, even affecting the ground as the area below then shakes.
If not because the world has been strengthened by the White Explosion, the ground beneath these two Titans would have crumpled and atomized by simply their energy.
If this was Earth Two, the area around them would have already turned to mess and might even affect the natural phenomenon of that world.
Imagine the impact of such shockwave produce by their attack.
Their attack is powerful enough that their speed was travelling through the air faster than the speed of sound.
Their strikes generate an enormous amount of sound energy, sounding like a huge explosion.