It wasn't a targeted attack. It was a natural disaster.
Whitebeard, standing on the bow of the Moby Dick, let out a low, rumbling laugh. It was a laugh that cracked the air. He looked down at the tiny, bleeding figure in the bay. For the first time since Ace had been taken, the old man smiled. luffy haki marineford
Aokiji, half-frozen, watched the boy collapse to his knees a moment later—the strain of the burst pulling him under. The Admiral said nothing. He simply looked at the pile of unconscious bodies, then at the crying child. It wasn't a targeted attack