Tin foil hat preview speculation:
Probably looking too much into small stuff, but it's the most fun I had with this episode.
My money is on David being the one who faints. With a slight chance of Gavin. In the preview Victoria looks to her right to try to see what happened. There are only 5 people to her right. Added with the way it shows Jeff run to the crew makes me think it's more toward the middle of the comp which eliminates Kelley, Eric and most likely Julia.
Probably looking too much into small stuff, but it's the most fun I had with this episode.