Shoulda known.....
I've had to move a cheerleader or two back and away from the endline before too. Never tripped over any though. Ouch.
I've also moved a cheerleading team or two to other areas where there was just more room to operate vice the endline.
Full disclosure - I was a cheerleader in college (D2) and had a blast. We normally had a lot of room to work with in our larger arenas/gyms and I can't recall this ever being an issue. HS gyms are obviously much more of a problem.