Compound fracture=quick stoppage of play. Girl holding her knee and screaming like a banshee=probably a quick stoppage of play. Why did I say probably? I've seen enough knees come completely out of joint in the past, in softball and football, to make myself vomit after seeing them. One was so bad the top of the bottom bones were above the bottom of the top bone (I'm not an anatomist so I don't know the freaking names!).