This is an article that was posted on "that other site"....sorry, I don't know the source. Maybe this will shed some light on the subject.
Should knee be taken for hurt football players?
The recent collection of letters to the editor and frequent chants from the stands on Friday night seems to make it clear fans are focused on the latest high school football trend: taking a knee when a player is injured.
The genesis of the practice is unclear. It could have come from soccer or football at pee-wee levels, where kids are asked to drop to one knee not so much out of respect but to keep them under control while the coach tends to the injury.
But somewhere along the line, as the players grew out of youth leagues and into high school, the on-field genuflect has come along for the ride.