He published a correction in the hardcover WhatIf that the "fusion zone" at the front of the baseball would not actually form, as the collisions are too fast fo

He published a correction in the hardcover WhatIf that the "fusion zone" at the front of the baseball would not actually form, as the collisions are too fast for fusion to take place. Instead, the protons would "ghost" through each other, resulting in some awesome energies and exotic radiation. Unfortunately, I can't find the underlying science behind this. Anyone know where that could be found, assuming it's still correct?