Jude was not a fighter. He was a talker, and a planner. But he knew the Dark Mark meant show up and assist, it meant to do the duty you had promised to do. Even so, he changed his look before he went. He arrived, looking like a man named Donnovan that he had met on his last trip to the Americas, with his Death Eater mask fixed upon his features for extra measures. He was taller, his face transformed, and much broader. No one would suspect the Undersecretary was here.
Though Jude was not a fighter, he knew how to duel. He had been a ruthless victor in Duelling Club, and he had passed every course the Ministry required their officials took to be consider powerful wizards. He looked about and raised his wand. A powerful sonic boom spread over the room, sweeping everything it hit back against the walls, sending glass and debris flying.
- - -
Jack looked up in time to see the spell. She was ripped from Charlotte, and pushed against the wall. She dodged a chair, but a shard of glass ran across her cheek. She brushed it away and put her own wand up, ceasing the effects of the man's spell.
- - -
An advanced spell. The only way to dodge it is to perform a powerful shield charm quickly. It would simply push everyone in the room against the wall with the furniture and whatnot.