If it were Ethan the roommate found (or Xana), and they just thought he was "passed out" or unconscious perhaps from alcohol, the roommates might not have wanted to call 911/LE since both Ethan and Xana were not of drinking age. They might reasonably call friends to come over to help and give advice as to what to do before involving 911/LE. There are numerous stories of kids sadly dying at frat parties and such from alcohol consumption, and no one wanted to involve LE.
If the person were turned in a way where they didn't see a bunch of blood, as others pointed out their first (or second or third) assumptions wouldn't be "murder."
If the person were turned in a way where they didn't see a bunch of blood, as others pointed out their first (or second or third) assumptions wouldn't be "murder."