A 58-year-old man with advanced lung cancer presents with acute dyspnea, hypotension (BP 88/56 mmHg), and elevated JVD. Bedside echocardiography is performed. The structure marked B in the diagram shows inversion of the RV free wall during early diastole. Which of the following best describes the pathophysiologic significance of this finding in the context of cardiac tamponade?

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