Wow, that is impressive.
When I was a USFS firefighter we often got called to lightning strike fires. What I saw was the remaining tree would have a neat groove carved into it, as if someone took a chisel to it and made the most perfect grooved non jagged cut imaginable.
The parts of the tree blown off and scattered around would be black and charred (and on fire, hence the need to put it out).
I always figured it was the positive/negative aspects of the lightning somehow. That the tree side would not have any burn, but the ejected side would be burned.