That silver-edged Yellow Topaz Locket, engraved with an intricate snake relief, really mattered to Kreacher. Once he realized someone had found his hiding place, he screamed in a bullfrog-like voice. Amid that piercing sound, Kreacher raised his hand, and a surge of magic rippled around him.
Everyone present could see it-the House-elf wanted to escape again. That would never do. They had already spent nearly two hours of their precious holiday doing volunteer work!
Spurred by anxiety, a row of wands rose in unison, but human bodies had their limits. None of them reacted faster than that chiming Music Box, not even Professor Moody.
"Ding-!!! Dong-!!!" the Music Box said furiously.
Yes, Kreacher's scream seemed to have enraged the Music Box. Burning with a fury that said, "Let's see who's louder, then!" it unleashed the loudest sound of its entire existence!
Its previously tuneless little melody now turned outright into unbearable noise, and the aura of Dark Magic carried by that noise made the remaining Exploding Screaming Eggs in the room join in harmony.
If the Muggles outside could have heard the commotion inside 12 Grimmauld Place, they would certainly have cursed:
"Are they mad? Who sets off firecrackers inside their own house at Easter? Have they got a death wish? Do they think they're God's dad?"
In fact, firecrackers would have been a conservative description. At that moment, a jumble of "Dong-aaah-!-ding!" piled wave upon wave of sound higher and higher. It sounded like three hundred people simultaneously sawing through a huge sheet of glass with serrated hammers!
Everything was far too chaotic and unexpected. Brian only had time to cast an Earplug Charm on himself before a Sound Bomb blasted him at close range. An unpleasant ringing still assailed his ears, and even his vision grew somewhat blurry.