someone asked me and I couldn't figure out the answer, so does anyone know? because if a werewolf bites a vampire they die, so if a hybrid bites itself, would they die too? I'm not sure if we've ever seen it happen on the show, only Klaus, but his blood is the cure so I guess it counteracts with him. but just ordinary hybrids?
so any ideas?
I think nothing because in situations like that protections goes before the attack.
A hybrid is immune against a werewolf bite, sunlight and silver. You need to rip their head or heart or a witch will have to channel enough power.
Still, they are vulnerable to both vervain and wolfsbane but I'm not sure if it's fatal, except it's possible Klaus is immune to both because he's a true hybrid.
As proof to your question though once in season 4 Hayley says hybrids are werewolves first, vampires second. That would explain why they can't bite themselves or each other because their werewolf side would protect the vampire side.