PRETORIA, South Africa — A woman screamed and then there was silence, according to South African prosecutors pressing a premeditated murder case against Oscar Pistorius. Next, the indictment says, witnesses heard gunshots and more screaming at the home of the Paralympic champion, who says he shot his girlfriend by mistake on Valentine's Day. The sequence of events outlined Monday could bolster an argument that the double-amputee Olympian was intent on killing Reeva Steenkamp after an altercation and was not reacting fearfully to what he thought was an intrusion in his home, as he has said.