Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: Jennifer Jareau:  Terra Mesa , New Mexico . Five dead , all from Mesa University . No signs of sexual assault , and no sign of theft .
Derek Morgan: Five nineteen - year - olds , minimal defensive wounds . One of them was impaled on a six - foot wooden pole .
Elle Greenaway: Who 'd want to torture five college freshmen ?
Derek Morgan: They were n't tied up and no one escaped ?
Dr. Spencer Reid: No single unsub could 've exerted this much control over so many people .
Elle Greenaway: So you think there were was more than two .
Jason Gideon: I think we 're looking at a pack .
Jennifer Jareau: A pack ?
Dr. Spencer Reid: _ Three _ or more that kill in unison . As in nature , the group dynamic dictates the pack 's survival is dependent on their ability to hunt successfully .
Aaron "Hotch" Hotchner: And as in nature , a pack will keep on killing until it runs out of prey or is stopped .
Elle Greenaway: Stopped by what ?
Jason Gideon: A stronger pack .

unsub