Trelawny was just sitting nearby his caravan, simply reading a book before he heard some scream from the trees nearby, getting up to grab his gun.

He only grabbed his gun for safety, he also grabbed his lantern so he could actually see out in the dark, investigating the scream.

"Is anyone out there? I've got a gun!" He yelled out, knowing that it was dumb to let a stranger know he was armed, but he didn't know what he was getting into.

As to which, you're a vampire just getting your dinner.