"Ugh, this math doesn't add up!"
"Math?" Theo drawled, amused.
"Yes, look!" She shoved a paper filled with nonsensical scribbles his way.
He raised a brow.
"What does," he pointed at a line, "this mean?"
"...if you take a whole, split it in half and then split that in half, seven times, you're left with 0.7% of the original."
"And?"
"Magick Moste Evile," she seethed, "states that a wizard needs upward of 10% of his soul to posses someone!"
"...what are you researching?"
"Look at the math, Theo. The math! Quirell should have been safe!"
"...sure."
"Ugh!"