You shoot William.
From Create Your Own Story
You push through the vile horror of the scene and aim with your expert precision, and steeling your mind you pull the trigger.
The bang echos through the room and a wet thunk of bullet hitting flesh reaches you. The monster howls, spraying blood out of a gushing head wound, leaping from the bed. It's a headshot but you suddenly remember your gun isn't loaded with silver, useless against the wolfman. The creature bellows and flees out the window, smashing through the glass and tearing off across the moor.
Lord Kellar is already beside the bed, trying to sooth his tortured daughter. She's alive but that's little consolation considering her experience. You look out across the moor and up at the glowing moon, menacing and cruel by it's inaction. You know what has to be done.