 Elementary, dear Watson, that is an absolute breakdown. It's 100% failure to secure the location. They might not be inside, but it's still penetrating your perimeter. Your perimeter isn't just what you see with the people inside. Your perimeter is everything that can cause threat to you. Martin, we know that the roof was in range of Secret Service snipers. They shot the gunman after he opened fire. But I mean, this might be a basic question, but should there have been an agent on that roof?