Lightning nearly struck this kid. What happened?

It seemed harmless enough, playing in the rain with an umbrella under an overflowing rain gutter. The thunderstorm was passing, and the worst of it was over. Then lightning struck—very narrowly missing the kid outside. It was so close that, in the video taken that day, it looks like he was directly hit by the bolt. It was so close that, even if he wasn't struck directly, he could have been seriously hurt by residual current.