Bobcats (about as dangerous to humans as feral cats but quite a bit more shy) hunt in huge territories (thousands of acres) which they wander through continuously. It's rare that you see one, let alone 2. The only time they stay put anywhere is when they have kittens to feed. What I suspect in this case is that mom was just returning to her normal wandering hunting lifestyle and junior was, unbeknown to him or her, now enrolled in bobcat school.
In the brief time I was able to see them before they disappeared around a neighbor's house the mom was all about hunting - poking around in all the bushes - and junior was all about being a kitten: batting at leaves, "play attacking" mom and jumping 2 feet straight up in the air when startled by something it stepped on. Except for its paws (which are huge) it looks pretty much like a large house cat with a bobbed tail. Mom, on the other hand, at about 30 pounds looks a little more intimidating.