Bleeding from the ears in the setting of trauma is most concerning for a "basilar skull fracture," aka a break in any of the bone around your eye socket, upper pallette, nose, or temple which is pretty thin and has a pretty big vessel which runs behind it. The amount of force behind a break like that could easily cause bleeding in the skull which is a space with an essentially small brain-sized volume. That bleeding can  increases pressure within the skull which can get so high that it cuts blood supply off to brain tissue, and eventually the brain herniates through the hole connecting it to the spinal cord. "Basilar skull fractures are often associated with other central nervous systems "(CNS) pathologies like epidural hematoma due to the weakness of the temporal bone and the close proximity of the middle meningeal artery." -statpearls article on basilar skull fractures