It would be everyone's best interest for Carla to bring this major outright fellony to the attention of her boss or other appreciate supervisor quietly letting them know she needed the file for the continuation of work, hopefully it was necessary for employer. I think too and often others in society have not developped moral and stay stuck in serving their own immediate action interest.
If there were a fire, explosion, or bomb threats in schools, for example, are required to evacuate but if it's a sniper or shooter then they do a lockdown. Because if the shooter is on the outside and they decide to evacuate then they could get shoot so most schools and places do lockdowns.
So the answer would be a sniper. I hope this helps!
Dangerous waste Might be produce