Ryan locks himself in the sound booth, so if he is the killer, he won't be able to kill anyone else.
Despite the massive "The Reason You Suck" Speech he just received, Chris protects Burnie from the killer's arrows, dying instead.
And despite the speech he just delivered, and the fact that Chris had just finished accusing him of being the killer, Burnie sees the killer and immediately pushes Chris behind him to protect him.
Lindsay saving Ryan from the Puma and dying in the process. Team Same Desk carries over into even this.