just_the_doctor

"Aubertines are hunters," he explains. "Extraordinary sense of smell. And they have a Vortex Manipulator, I saw it on one of their wrists. They can track us across time and space. Right across the universe. But they don't live long, and they're bound to be winding down, which is why they're so desperate to get to me. But they never got close enough to get a good look at our faces. So, we go to ground. We hide and wait for them to die."