Meanwhile, Meadows said to Harry, Hermione and Sirius, "It didn’t cost my magical core much more to cut through the wall with my magical laser than to repair the wall with Reparo. Speaking of which, Reparo works on what the laser cut apart only because the wall wasn’t alive when I pointed my magical laser at it. When a magical laser is turned against a living person’s limb, the magical laser both severs the limb and cauterises the limb—and you know what this means."