Ok so I saw a Vampire Fledgling running on the road so i brought out my weapon and waited for it to attack me or for my follower to attack her but the vampire just ran right past me and my follower and everything it ran past , animals people and vigilant , nobody cared or even noticed this random vampire running somwhere and after a while of following her a group of thalmor attacked me and she stopped and watched for a few seconds we killed them and when i looked back she was gone I ran up the path and no trace of her and the fight only lasted a few seconds. Can anyone tell me why this happened?