The BAU determines that the killers are most likely college students because the murders began at the start of the fall semester. They describe the group dynamic as a "pack," where a dominant alpha manipulates "weak-minded" followers into committing crimes they otherwise might not.
: The dominant leader who performs the actual killings. [S6E7] Middle Man
: The killers are a "pack" of three college students: The BAU determines that the killers are most
: The BAU tracks the remaining two UnSubs to their house where they are holding a victim named Stephanie. [S6E7] Middle Man