Some people who get directly struck by lightning and some more than once (starts at 00:25) survive while others die instantly or later on due to complications/injuries.
Looking at a wiki page for Lightning injuries
Lightning injuries are injuries caused by lightning strikes.
They result from three factors:
- electrical damage.
- intense heat.
- the mechanical energy which these generate.
While sudden death is common because of the huge voltage of a lightning strike, survivors often fare better than victims of other electrical injuries caused by a more prolonged application of lesser voltage.
Lightning can strike or injure humans in four different ways but I'm going to focus on direct strikes.
Reported mortality rates range from 10–30 percent, depending on the source of data. Most people who are struck by lightning live to tell the story, but many suffer from long term injury or disability. Airforce medicine site
Is there a physiological reason why direct lightning strikes are not lethal for everyone or does it all come down to dumb luck?