[Gilly G]

The names are in alphabetical order, so people in red have names starting with a later letter in the alphabet.

If the red line is between people who have not submitted scores, random.org will choose I think. Or it'll just be the people at the top, I'm not sure.

The first few rounds, plenty of people do not submit so the red line is bound to be between people who haven't submitted. In later rounds, this will not happen anymore.