This photo shows the damage that not only a fire can do, but also the damage that a fire extinguisher can do. Even if someone used a fire extinguisher and contained or put out a fire, there can still be a strong odor and chemicals that need to be removed from the building/home.
The chemicals from a fire extinguisher can coat a room quickly and leave a thick dust behind. Normally this extinguisher dusting comes along with a coat of soot. Even if a fire has been small and quickly put out, the smell and chemicals left behind should be properly cleaned out of the space. You can see in the photo how apparent the soot and extinguisher's affects are. This is just one corner of the room, but this entire living room was impacted.