No, he saw Xana and Ethan before the police arrived. The surviving roommates and the friends outside at that time (of the bodycam) weren't aware that their friends were dead. Only Ethan knew (he wasn't aware of M&K though)
Okay maybe it is some sort of an assumption of mine but I thought they overheard the officer say quadruple homicide. Perhaps I made that connection and should not have. Been a long week.
Also, college students should assume and I linked the crying to them grasping they were gone to the crime scene tape going up, the seriousness of the approach, and the fact that nobody who was an EMT went into help. I think they knew. JMOO