"Severus!" She yelled, hoping that she was moving towards him but wasn't certain. She was in pain, and pain meant that she was still alive, and she took that for the only good omen she had right then. She kept moving until the Silence claimed her and threw her to her knees, and she relied on gravity to give her some direction as she tried to at least keep crawling. Pain means you're alive. Moving keeps you alive. Just keep crawling.