: The breakthrough comes when Dr. Spencer Reid identifies a ritualistic behavior. He recalls a science lab assistant, Clara Hayes , who displayed obsessive-compulsive traits, specifically counting in threes.
: The team initially struggles to determine if the victim was targeted or simply in the wrong place. They eventually realize they aren't dealing with a typical "serial arsonist"—who usually finds pleasure in watching things burn—but rather a serial killer who uses fire as a weapon. [S1E2] Compulsion
"Compulsion" also deals with the psychological aftermath of the pilot episode for : : The breakthrough comes when Dr
: This episode marks early bonding moments for the team, including the first shared scenes between Penelope Garcia and Jennifer "JJ" Jareau. Notable Quotes who displayed obsessive-compulsive traits