Originally Posted by
Polaris OBark
It wasn't at all narrow, and even had a dividing line down the middle. It was most likely directed at me, not the followers.
It most definitely was not directed at you. "Bike up", "Hiker up", "Car up", etc. are all used to communicate that the group is approaching the mentioned object. In mountain biking groups, obstacles like logs, other riders and hikers are called out in a similar fashion. Some people are a bit overzealous in their yelling out of these warnings.