Anyway, I know it sounds crazy that this guy(s) would hurt LS, who presumably had nothing to do w/ whatever drug/$$ could have been going on but I also think it's possible, given all the conditions she could have been under and how out of it she could have already been that just a simple confrontation/her getting scared/nervous/shocked could have been enough to hurt her.
Here is a photo from Fox News:
Suppose ... that LS were frightened by these characters and perhaps her own suspicions about their behavior. Might she have gone into hiding? Did she have any close friends outside of the college possibly living in the Bloomington area or within a few hours drive? Note the expression on her face in that photo, and the body language.