You stay right where you are. I mean after all, it doesn't look so big. The moving figure jumps at you and makes you land on you back, you hear a scream from Shara your starting to fade into black. You try to identify the black thing on your chest. You try to move but can't because of the pain on your back. You know you have enough energy to shake him off and call for Shara to try and kill it, or just fall unconscious and find out what happens when you awake.