[Eisdrache]

It is impossible for that guy to be the another since we still haven't had the falling chandelier (which they clearly made the effort in making it stand out when they entered the lodge) from the OP.

Also I can't help it but think that there might be another reason as to why Izumi decided to blame Mei in front of the class. If you think about it it's confusing how they somewhat got along with each other but suddenly she decides to confront her while everyone is present.

As for the dead guy (assuming he's dead), it's probably the one with glasses (can't remember his name). They showed him walking up the stairs and Mochizuki on the bed right afterwards. It would be very strange for him to suddenly get involved with the other guy (~brown hair) when he had absolutely zero connection with the main cast so far.

Also I'm seriously considering watching the last two episodes together ....... but maybe the wait will get the better of me ;_;