The interviewer wants to know if your reactions to problems reflect maturity and professionalism, as how you react will significantly determine how you fit with their existing team. They also want to see your first reaction when a major problem arises to assess your problem-solving skills and ability to prioritize safety. It's essential to remain calm, assess the situation, gather information, and communicate effectively with your team to find the most efficient and safe solution. Prioritizing safety is crucial in this line of work, both for yourself and your team members, as well as for the public. Demonstrate to the interviewer that you take a very systematic approach to problem-solving rather than reacting in an impulsive way when a problem occurs.