Listen to 10 seconds, please.
Does he sound ok to you? Seriously.
EDIT: those are some of the communication disorder due to brain trauma:
A brain injury can affect our communication abilities by impairing hearing, the muscle movements of speech, or the cognitive processes that turn our thoughts into words.
Communication problems vary, depending on an individual's personality, pre-injury abilities, and the severity of the brain damage. Typical effects may include:
- slow or slurred speech
- difficulty swallowing
- drooling or a nasal tone
- problems with finding the right words
- trouble with understanding others.