Monday: Everything is fine now.
Near the end of their hike and my run, our 9 year son ran ahead of us on the trail, took a wrong turn, wondered around the forest for hours while we frantically searched for him, encountered a bear, and was eventually picked up around sunset by the search and rescue team we requested via SOS on our satellite tracker (we were an hour drive from cell signal). Many thanks to the Placer County Sheriff Department for coming through for us in a big way.