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"It's a pity we couldn't go to Ollivander's to replace my wand. Or maybe repair my old one - I miss it. Even more since it was the only brother wand to Voldemort's," Harry moped.

"I told you that doesn't work; you can't just replace a core. The wand is gone. We can frame it for your wall if you like, but it's better you use it to delude others. And it's really disturbing how you whine about the brother wands - why do you want to have something in common with him, of all people?" Tonks inquired with a disgusted face.

"With brother wands, I have the protection the Priori Incantatem effect when I fight him," Harry informed her.

"Why would a wand echo help you against Voldemort?" Tonks laughed at him.

"Because when we duelled at his resurrection, the brother wands locked up and kept him from hexing me - the golden dome also kept the Death Eaters away from us," Harry hotly replied. Instead of acknowledging her ignorance, Tonks looked at him with concern.

"Are you feeling fine? Maybe we overdid the shopping a bit - the poor boy is talking in riddles. Maybe we should have waited a bit longer before we let you out of bed," she said, and Margret tried to feel his forehead.

Harry batted her hand away angrily. "I am fine. Don't you know that brother wands can't be used to fight against each other?" he said, but everybody just looked at him in confusion, even Hermione.

"And how would that work?"

Tonks raised an eyebrow at him. "Who told you that kibosh? That's the most insane thing I ever heard!" she said, and Harry rose to his defence, but slumped when he remembered the source.

"Think about it for a moment. My wand has a dragon heartstring," Tonks said, to which Hermione added a "Mine, too."

"See? Ollivander once said that he makes close to five hundred wands out of a single heart. This would mean that my wand would be useless against hundreds of others! And unicorn hair is nearly as bad, since there are only few of them. And while I heard stories about wands locking up occasionally, I've never seen anything like it," Tonks told him. "What exactly happened to make the wands lock up?" she asked as an afterthought?

"Our spells hit each other."

"Ok, that causes the weirdest effects, for sure," Tonks agreed. "I remember the time I hit someone with a jelly legs jinx while someone else petrified him. We needed a mop to get the poor sod to St. Mungo's to have the mess reversed. What spells connected, and how? Maybe we can reconstruct the events."

"My expelliarmus connected head-on with his killing curse," Harry replied.

"Ooookay. In that case, I believe we'll forego a simulation," Tonks chuckled, "but enough of this. I'm starving, and the elves are just waiting for a chance to stuff us to the gills!" she started and turned to leave for the kitchen, but stopped when Hermione started talking.

"Sorry, but that doesn't add up," she said, her forehead wrinkled in concentration. "If Tonks was right, your wand was already broken back then, so there wouldn't be any core left to interact."

"You're right," Harry blurted out as something else hit him. "And remember the Quidditch World Cup? Crouch stole my wand and could cast the mark with it. And his dad could cast priori incantatem on it. It still worked back then, so your theory got just shot out of the water, Tonks," he concluded with a smirk at his minder.

"Bite me, luv!" Tonks huffed at him. "Then you probably burnt it out during the wand lockup thing you told us about," she told him with a sneer, turning again to leave, but Harry held her back once more.

"But when the Dementors attacked me and Dudley last summer, the ministry was still able to track me casting the Patronus spell, so it must still have been okay back then," he told her. A second later, his face lit up in a huge smile. "Come to think of it, I did my first wandless magic back then – I lit my wand with a lumos while I was searching for it!" he told them, and Hermione used the opportunity to hug Harry. Any opportunity to do so must be used, she thought.

"Arrgh!" Tonks yelled, stomping her foot as her hair colour started cycling wildly. "Can't you nitpickers leave well enough alone? Fine! How about this: When Harry defended the Dementor swarm, he nearly burnt his wand out, but it still worked a bit. He had to start compensating with wandless magic to keep up in class, but it worked well enough for Crouch to use it and leave an echo. There was still an core left, so it interacted with Voldemort's wand. Then, when you used it to chase off the two Dementors in Surrey, you burnt out the rest, or maybe you did that during the Battle of the Ministry!" she yelled at the group, advancing at them while waving her finger at them repeatedly, which made them instinctively yield ground and back into the wall as the irate witch ranted at them.

"Satisfied? Or shall I go to Ollivander and ask him for forensic research into when the wand got broken? It's ruined; you can cast wandless, and everybody is happy - now let me get dinner!" she yelled at the group, which was shrinking into the wall as she towered over them, her hair morphed into a writhing mass of snakes. With an angry screech of frustration, Tonks abruptly turned around and stomped off into the kitchen, where two scared yells and the sound of breaking cutlery sounded, followed by Tonks screeching again.

http://www.fanfiction.net/s/5721324/7/