Adhesive Small Bowel Obstruction Transition Point

A 54-year-old man with a history of multiple abdominal surgeries presents with 36 hours of progressive colicky abdominal pain, bilious vomiting, and obstipation. CT imaging shows dilated proximal small bowel loops with air-fluid levels and a completely collapsed distal ileum and colon. The structure marked **B** in the diagram demonstrates an abrupt transition point with tapering (beak sign) in the mid-abdomen. Which of the following best describes the pathophysiological significance of this transition point in adhesive small bowel obstruction?