She froze
The man fixed his gaze on Lena, waiting for her to say something. But Lena could only stand there. “Um, miss?” Can I assist you?”the man ultimately inquired. That appeared to bring Lena back to reality. “Yes, actually,” she responded as she gathered herself and smiled at the man. “I think you can.”
Explaining everything
Lena told the man what was going on and what she had seen. She told the man about her late husband and observed a shift in his manner. He suddenly appeared aggressive and offended, rather than sympathetic. What was he concealing? But who was this odd dude on the plane? What specifics did Lena notice? And why was he behaving strangely?