How we cite our quotes:
[Bella:] "…a pile of human bodies, drained and lifeless." (2.128)
Bella recognizes the faces of her school friends and parents, and fears that's what she's going to do, what she will become.
[Bella:] "I knew the sacrifice it has taken him. And then I'd ruined it, turned his gift into a disaster." (4.222)
Bella knows that Jacob is making a sacrifice in attending her wedding, because witnessing her happiness with Edward, another man, causes him great pain.
[Seth to Leah and Jacob:] "They're people to me, and I'm going to protect them, 'cause that's what we're supposed to do." (12.63)
Seth has developed an affectionate relationship with Edward and the Cullens. For him, they're no longer vampires, they're people, and he considers it his mission to protect them from harm.