Last yr working a JV game, I was on the wing covering the second half kickoff and as the runner took it up the sideline, and the defender was closing in to tackle him, I stopped to let them pass by. The runner was tackled out of bounds 5 yd in front of me. As I'm blowing and killing the clock, I got hit in the back of the knee by players chasing the play. ACL, MCl, patella tendens, tibia cracked, a job well done. AS the trainer helped my up to the bench one of the players said, "Way to go ref way to take a hit" I must admit it did bring a pained smile to my face. After a total knee replacement I'm back on the field with no regrets.