blind people in chaos

A friend of mine who happens to be blind was running the Boston Marathon this week when the explosions took place. He is fine. He did not finish because of the bombs. He was worried about his guide dog who was waiting at the finish line. But, all were okay. It got me thinking. Thinking about being blind and in a chaotic situation. Like in a fire, or bombs going off, or flood or tornado. If your landmarks are moved. If things around you change. If everything is noisy it is more difficult to navigate the world around you. However, at times it might be an advantage too being blind in these situations. If it is dark and hard to see for example.