"Severus Snape wasn't yours," said Harry.
"Snape was Dumbledore's. Dumbledore's from
the moment you starting hunting down my mother.
And you never realized it, because of the thing
you can't understand. You never saw Snape
cast a Patronus, did you, Riddle?"
Voldemort did not answer.
They continued to circle each other
like wolves about to tear each other apart.
"Snape's Patronus was a doe,"
said Harry, "the same as my mother's,
because he loved her for nearly all of his life,
from the time when they were children.
You should have realized,"
he said as he saw Voldemort's nostrils flare, "
he asked you to spare her life, didn't he?"