Chi, or Chee, or Qi is a belief in supernatural forces to explain the psychiatric outcomes of performing Qi Gong exercise katas in groups.
It is essentially a belief in magic.
When Qi Gong is performed in groups each person attempts to engage eyes-open meditation to harness the believed Chee energy while performing a slow motion martial arts Kata. As they do that they actually engage a primitive vision driven warning system that will attempt to break your concentration with a startle when movement is detected in peripheral vision.
To be able to continue meditating with eyes-open you must learn to ignore the detected movement in peripheral vision. But that does not turn off the brain system that subliminally detects threat-movement to trigger the startle.
That subliminal detection and your brain's effort to warn you are a Subliminal Distraction. It is a normal feature of all human physiology.
In the 1960's designers accidentally discovered that this subliminal stimulus of the subconscious would eventually cause a mental break.
This feature of Qi Gong is recognized as a Culture Bound Syndrome of China. It is one of the CBS's included in the current DSM. (Diagnostic and Statistical Manual of Mental Illness of the American Psychiatric Association)
The Virginia Tech shooter created these "special circumstances" for Subliminal Distraction exposure when he used the suite common room to study with his laptop. As he began to have the usual outcomes of exposure, fear, paranoia, depression, and thoughts of suicide, he acted out the delusions of the mental break by planning and killing 32 people.