You, Evan and well as everyone else have been close since highschool. You all kinda clicked. As such even when you guys were in highschool you still met up. Since you guys knew eachother so well, you could very well tell when something was wrong. And Evan was what was wrong. He wasn't himself..and his very presence was scary. But after leaving, and realizing you forgot your bag you quickly drove back only too find him from after he faught and killed Nate in self defense. Nate tried to kill him.