The episode features several notable physics-based plot points analyzed by scientific consultants :
Recognizing the impossible situation, Charlie makes the choice for Mac, sacrificing himself to save the civilians. The elevator cable is cut, and it falls, resulting in Charlie's death. The Adversary: Elliot Mason [S3E22] Mason Cable Choices
Mac builds a makeshift descender to travel down an elevator cable by using friction to support his weight while allowing controlled movement. Charlie makes the choice for Mac