Keep seeing that post where OP starts like 'Thinking about...grieving the undead' and then adds on about like. Real life situations where people have not died but have left your life and you would have reason to grieve them.
All respect, that's an important concept, but that is not what I am thinking about when I read 'grieving the undead'.
Especially since Cass has been a vampire the entire time.
She gets her drinks from the med bay, wears expensive high quality sunscreen and minds her powers. Most stuff the family believes in is movie propaganda. So imagine her surprise when a cute and tasty boy instantly recognizes as a vampire.
Danny has little experience with actual vampires. Most just comes from his godfather, who is a half ghost vampire, but its enough to recognize a beautiful vampire girl on his field trip in Gotham. He just has to ignore it and not draw attention to himself.
when I'm writing arguments between vampires, i think a lot about the way that cats fight. when cats clash over something, they make a lot of noise and a lot of physical gestures at one another. it's really uncommon for them to seriously get into a physical scrap, and extremely unusual to see them begin an altercation with another cat with a physical attack. this is because they know, implicitly, that they can kill one another. cats, being cats themselves, understand that a cat is a very efficient killer. all the vocalising, the hissing, the gutteral moans, the hair-stood-on-end, the jagged postures; all of this is happening in order to attempt to avoid a physical fight. each movement and sound has an implicit meaning. the cat is saying 'hey, remember i can kill you', and the other cat responds 'yeah, remember i can kill you too'.