First college game was a spring game (D-II). I am a wing and a pass is completed and I am running to the spot. After the play is completely over, a D-back comes out of the blue and runs me over. I see my feet and sky as I tumble backwards. After the dust clears, the head coach says, "Help him up!" I get back to the sideline for the next play and the local sportswriter, whom I know from my coaching days, says, "A quicker guy would have gotten out of the way." Thanks!
Lesson learned: College guys play to and beyond the whistle. It's ok to mark a spot 30 yds away from the ball! Be safe.
PS- I got knocked down later in the game on a sideline play where about 7 blockers and tacklers were flying toward the runner near the sideline. I was OOB when I got my legs taken out.