When blood mixes with brain fluid, it will make a person vomit, and the
blood loss alone can be deadly. For example,
in burst brain aneurysms, which is when a blood vessel in the brain ruptures and bleeds, a person vomits all over the place, eventually passes out, and usually dies within 24 hours from brain damage from blood mixing with brain fluids, and from the clot pushing on the brain, and also blood loss.