Not all people are fully mentally capable in all regards, not all people have full vision, full hearing. Fires are unexpected. Let's say you were a college student, or you were being interviewed for a new job position, and you went into a building you had never been in before, or to a part of that building you never had been in before and a fire started. Now let's say you are expected to remember what turns along the way you took, and where the exits were, in a smoke filled room while you can't breathe or see very well, at the very least. Just think about it.