lol Different colors so he can keep track of which swing goes to what student. Notice the pants are pulled up and his collar is up? Can see his ankles. He'll also shoot video with the pants lower, collar up, collar down, visor in different positions, visor with the line, without the line. So that combination of collar up, pants pulled up, orange pants, is a specific swing for a specific student.
I don't know why? But after reading this... And from our discussions about Mac, (and I know this is off topic, so I apologize to mchepp for this)... But I'm picturing Mac as Annie Wilkes? And the 'student' sharing said swing video as Paul Sheldon, if Mac found the video was shared with an outside party.