"I don’t think the curse had the same effect when it’s woven into an inanimate object as when it’s cast and held with intent. I was going to talk to Theo in the morning about my theory and perhaps run some experiments. The curse had to be modified to fix it to the doorway." Hermione shifted back out of Harry’s arms and sat up on the couch facing him. "Normally if you hit a door with a Cruciatus, the door would have shattered. I think the curse was weakened and woven into a charm, to overpower the intruder by the sheer number of pieces that would be embedded into the skin. If the victim was even able to remove the pieces, it’s unlikely they’d be able to get them all, slowly torturing the person to death." 