Deputy Billy Kitka: You know, Beau's not so bad. Why'd you bother writing him up?
Sheriff Eben Oleson: He lives all alone out there on the south ridge. A little citation now and then lets him know he's a part of this town.
Stella Oleson: I should have fought harder, kept Wilson here.
Sheriff Eben Oleson: It's hard to stop someone when their family's at stake. The things you'll do to save your own.
Stella Oleson: We were like that once... weren't we?
Sheriff Eben Oleson: They're burning down the town.
Denise: Nobody will know what happened. They'll just think it was some horrible accident.
Lucy Ikos: Next time they'll take out Point Hope, Wainwright.
Doug Hertz: They don't fall down when they're shot.
Beau Brower: Hell, neither do I.
The Stranger: Mr. And Mrs. Sheriff. So sweet. So helpless against what is coming.
Stella Oleson: He's just trying to freak us out.
Jake Oleson: It's working.
Sheriff Eben Oleson: We have more important things to think about. I'll check on Gus.
The Stranger: Check on Gus. Board the windows. Try to hide. They're coming. This time they're gonna take me with them... honor me. Yeah. For all that I have done.
Sheriff Eben Oleson: They? Who are they?
Jake Oleson: I saw them feeding on Grandma Helen. They're like, vampires, you know?
Stella Oleson: Vampires don't exist, Jake.
Answer: The hiding man had no idea what had happened to him and so was just running on his new animalistic instinct. Eben became a vampire knowingly, willingly, and so he was able to move past that stage immediately. As you can see by the behavior of the lead vampire, a bit of restraint and humanity is not impossible to achieve. The lead vampire did not want anyone turned because that would mean more vampires to share the blood with. He didn't anticipate much in the way of resistance from the humans, they being weaker, slower, creatures.
Phixius ★
Also, the man under the building was attacked ~7 days earlier.