Add a rock-chipping impact effect to this video. Do not change the…

Add a rock-chipping impact effect to this video. Do not change the action, the timing, the camera movement, the framing, the lighting or the grade — every existing frame stays exactly as it is. The right giant keeps the same wind-up and the same punch, and the left giant's head still snaps away from the blow exactly as it does now, at exactly the same moment. Timing: during the wind-up nothing happens at all, no dust and no fragments. The effect begins on the single frame the fist touches the left giant, at the same instant his head starts to turn away — not before, not after. It lasts only a moment. On that contact, several chunks of black stone are struck off the point where the fist lands. They are knocked away hard in the same direction the fist was travelling, launched off the body in fast spinning arcs, then losing speed and dropping out of frame. A thin spray of grey dust is knocked off along the same line. The force is directional, following the path of the blow — the stones are batted away like debris struck by a hammer. This is not an explosion: nothing radiates outward in all directions, there is no shockwave, no fireball and no billowing cloud. Only a few chunks, thrown fast along one line. Once they leave the frame nothing lingers. The stones match the existing look exactly: the same black volcanic rock as the giants' bodies, the same monochrome grade, crushed blacks, film grain and motion blur. Add a hard dry crack of splitting stone on the contact frame and the clatter of the flying chunks. Keep any existing audio unchanged. No music, no voices.