My WAG is they were probably returning to homebase for maintenance or recharging. Maybe there was a fault in the code and the default is to head back for a firmware upgrade.
What concerns me is that you have a grade A, all-star, Chief Number One threat to public safety right there. Imagine a firetruck having to plow through those congested streets to try and get to a burning house before it becomes a burning block of houses. Or an ambulance with a stroke patient racing the clock to get to a hospital.
My WAG is they were probably returning to homebase for maintenance or recharging. Maybe there was a fault in the code and the default is to head back for a firmware upgrade.
What concerns me is that you have a grade A, all-star, Chief Number One threat to public safety right there. Imagine a firetruck having to plow through those congested streets to try and get to a burning house before it becomes a burning block of houses. Or an ambulance with a stroke patient racing the clock to get to a hospital.