Vignette

During a family therapy session, David (38), largely withdrawn throughout, suddenly begins speaking about 'the government monitoring my thoughts through radio waves' and that 'people on the street are talking about me.' He becomes agitated, grabs his coat, and says he needs to leave immediately. His wife Maria and teenage daughter look uncomfortable and embarrassed. The therapist observes pressured speech and flat, disconnected affect. What is the MOST appropriate FIRST step?