I think it’s everyone but I don't think there aware of what they’re doing almost as if there being controlled. I think this because of how you find Sal wondering the halls before you can save him. It may have been because of what Dean gave him but it also seemed off in some other way. But that's not all if you pay attention you can pick up hints from the other suggesting that regardless of who you try to date it seems like the same events are still happening to them. Sal jumps when Dean says beary the hatchet and if you play through Sals route you wold know why that scared him. That being said I think Sal was supposed to kill Roswell and I think Dean is supposed to kill you or Tyson and I think you as the player are the one that kill the person on day 8 because you where outside your sound proof room you should have heard what happend but you don't. That’s the only 3 I can really link right now. Sal and Orlandos route seem to give me the most info right now.