"Because... they can't get hurt the same way you were?" guesses Bella.
"Has it been this way since you died? Were you ever that angry before?"
"I bet. If anything could make somebody mad enough to kill it'd be getting murdered."
"I'm sorry," says Bella.
"My other friend found David's obituary," Bella says quietly. "He died on November fifth. 1933."
[Cause?] Bella asks Giles. Jarvis presumably already heard over the phone what she told Minnie and knows that he can stop looking.
"A vampire got him," Bella adds. Normally she wouldn't tell anyone this, but Minnie is already herself a ghost. [Any evidence he turned?]
"D'you think you'll be less angry now, or did it not help that much?"
Bella nods slowly. "I have a little bit of magic," she says. "I'm going to try and see if it can un-angry you, okay?"