Evergreen High School students are getting ready to return to their classes this coming Thursday. As updates continue to trickle in from the district about what measures will be in place, many, like senior Tyler Guyton, know it will be difficult on a number of levels.

"I've had friends drive past the high school, had to pull over and throw up," he told CBS News Colorado. "Had to turn around and go home. Couldn't make it past the library, so it's gonna be a mix of emotions."

CBS

While Tyler, the student body co-president, wasn't on campus that afternoon, around 200 of the 800 members of the EHS community were. Some witnessed the shooting occur, some ran, while others weren't even in class yet. That wide range of experiences, and the corresponding emotions that go with them, meant that st

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