One more minute before he came of age.
One more minute before the spell Dumbledore had casted on number 4 Privet Drive was lifted.
One more minute and he was no longer safe.

“Ah, you are a Lestrange? Yes, I remember sorting your parents. Slytherin, of course. I mean, your mother was a Black! I could gladly place you in Slytherin, because that’s what I do, however I think you belong somewhere else..."

Countless times in her dreams, Filian had been reunited with her mother, who had looked clean and healthy and young, like the woman she knew in her locket.
But this Bellatrix standing before her, breathing as though she had been running, looked as though she really did have the occupation of being a loyal servant to one of the darkest wizards of all time.

“She wanted something else too.”
“Yeah?”
“Yeah. This.”

She touched the locket around her neck and Harry’s suspicions were confirmed. Filian had the Horcrux he was looking for.