After approximately 25 minutes of a 30 minute therapy session focusing on mobility and activities of daily living, a patient diagnosed with multiple sclerosis reports feeling extremely fatigued. The therapist promptly takes the patient's vital signs and concludes they are unremarkable. What is the MOST appropriate therapist action?

1. Discontinue the treatment session
2. Modify the intensity of the current therapy session
3. Complete a formal reassessment of the patient
4. Contact the referring physician to discuss the patient's condition

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