Space that's my best guess
First I would have my friend call an ambulance while I checked his pulse. After this, I would most likely have my friends call for help in the hallway. Then I would try to put him against the wall in an upright position. Then I would try to get a response out of him whether verbally or physically. After this, I would wait for an ambulance to get there while sitting him up and trying to wake him up at the same time.
