Final answer:
Derek's decision not to disclose his recognition of Sally is a matter of professional discretion and aligns with the principles of prosocial behavior and decision-making in emergency medical services.
Step-by-step explanation:
The scenario described where Derek, an EMT, chooses not to disclose his recognition of the patient as his mother's neighbor, Sally, touches upon concepts related to self-disclosure and professional discretion in prosocial behavior. In the professional context, an EMT like Derek may opt for discretion to maintain professionalism and to ensure the patient's comfort and privacy. This restraint can also be seen as a decision influenced by his training and the understanding of his role in an emergency. While social relationship dynamics might dictate a different approach in a personal setting, when acting in his capacity as an EMT, Derek prioritizes the immediate medical needs and the guidelines he must follow over personal recognition of the patient.