"Ok, I'll tell you a family secret now. I'm from a very ancient line of seers." Luna told and sighed. "Being a seer is a heavy burden…"
"Reducto!"
Luna's head disappeared in a blood fountain.
All DA members immediately stood around the corpse, wands out and trying to find a murderer. Alas, this search was unsuccessful.
Severus Snape removed the Disillusionment Charm from himself, put his wand into the sleeve, and entered into Headmaster's office.
"Severus. Was it necessary?" asked Dumbledore without his usual eye twinkle.
"Yes, it was."
"Explain, please. And be VERY convincing, or I'll end you right here, right now, regardless of your spying."
"Do you remember, how all this pile of dragon dung happened? One batty seer made a prophecy…"
"So what?"
"Do you really want to know WHAT exactly could Lovegood divine?"
Dumbledore thought a bit.
"This was REALLY for Greater Good. One seer was enough to put us in all this shit, another one, even more fruity, would kill us for sure."