Fire Cause Determination No. 1 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 3 of 16 3.  Smoke so dense that it conceals the back and sides and other reference points that you normally use to guide your team from place to place can cause you to experience what’s known as __________. Choices: Ocular dissolution Social disruption Spatial disorientation Optical distortion