I don’t think it was streaming, but it IS all (reasonable IMO) speculation.
I was just listening to one of the parents speech at the vigil, referring to how close the two girls were, he said “they went to HS, college, lived together, and died together, in the same bedroom and bed.” To me, this was a bombshell. There were two bedrooms on the third floor and they each had their own. So why did they sleep together that night? (No mention they were gay and had boyfriends) so did something scare them OR did someone come home or meet them and they put him/her in the other girls room? Possibly the other couple bright someone with them and told them to sleep upstairs.