According to my research on studies made by different medical professionals, It is said that Hematoma is generally defined as a collection of blood outside of blood vessels. There are different types of hematoma. The one described in the question fits the description of Chronic subdural hematoma. This is a type of hematoma that is located under the covering of the brain (dura) and it begins to form several days or weeks after receiving a head injury.
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donot engage any negative energy with this patient find an explanation for the hostage situation and gradually find away to get the patient to release the other client being held against their will . please don't agitate the situation any longer and be sure to call for help