The document discusses casting choices for two roles in a film opening sequence. Bradley Smith is chosen to play the antagonist Lloyd, a 17-year-old psychopathic murderer, because he fits the role well and understands what the writer wants to achieve. Graham Teasdale is chosen to play the doctor because his older appearance and beard suggest intelligence and wisdom fitting for a doctor, though his role is overshadowed by the antagonist. The doctor ensures Lloyd takes his medication and cares for his patient, but doubts Lloyd's humanity, allowing Lloyd to take advantage.