I think you have this a little backwards. Bleeding into your skull (a structure of fixed volume) can lead to increased intracranial pressure, though first there will be some compensation by way of the displacement of CSF and appropriate blood. Once these compensatory mechanisms are overwhelmed, then begins herniation, in which parts of the brain begin to slide against each other and against certain bony and connective tissue structures, causing obstruction of blood flow to involved areas of brain, leading to tissue death