OH GAH... You basically lived my worst fear whenever I ride a roller coaster. I'm ridiculously phobic about people getting sick.
(Sidebar: How does a person make it to adulthood without knowing whether they have motion sickness?)
The weird thing was that it was an older gentleman that was getting sick. He looked VERY PALE when he got off. My wife has a real weak stomach and she started gagging when I just TOLD her about it.