Correct.
I can imagine that if there had been armed individuals that there is a good
chance that they would accidentally shoot a "good guy". We are talking a
dark confusing place and it would be easy to mistake a "good guy" trying
to take out the "bad guy" not to mention that you might miss and take out
an unarmed person.
What they really needed was a proper alarm system so that when the
fire door was opened that an alarm would have gone off and the lights
gone on.