Hello :) so I saw only part of it a while back and so I only know a little bit about it.
It was definitely on the horror side - there were humans vs vampires and (I dont know if it was for just that episode or if it was the entire series) but the humans were the ones hunting down the vampires. The vampires weren't evil and were just regular humans, but the humans were rude.
The scene I saw went something like this: Some vampires are crawling through a narrow tunnel (head to butt) trying to escape the humans - they are obviously panicked and some are crying. Then one by one, the humans begin to rip them out of the tunnel. Pretty gruesome. After they rip them all out, you can see a massacre of bodies around as a large man comes up to one of the vampires (Who is burning, if I remember correctly because of the sun) and he says something that makes it evident that his son was killed by a vampire and then he kills her and the rest of the humans around him console him.
I'm afraid that is all I know, any help would be extremely appreciated! <3