I think it's patently unfair to ass-ume that there's some "trouble in Shangri-La" or that this has anything to do with the ALLEGED "Lindsey blocking Stevie's view of Kristen" incident. I'm sorry, but whenever I try to picture that, I LOL. I keep imagining Kristen holding a baby over her head, like Tim Duncan, and LB is Shaq, playing guard, lunging left and right to "block" Stevie's view.
Ass-uming what Cory said is true, PERHAPS Stevie began feeling worse and worse as the show progressed, and didn't want to give a half-assed performance of SS. And THEN she bashed LB in the face with her tambourine backstage, and THAT'S why he was bleeding!