George was leaning back in his chair in the back room of the Wheezes when the Patronus arrived; he'd been tinkering with a trick wand that was malfunctioning - it turned into a flounder properly, but would not turn back into a wand once the trick was completed. Fred was in a distant part of the back room, taking inventory of their current stock. At the appearance of the silvery animal, George leaned forward and listened to its message intently before springing into action. He leaped to his feet and called out to his twin, "Fred! We've got a mission - get your sorry arse out here!"
While he waited for Fred to join him, he moved to the shelves where they stored some of their defensive items and started shrinking them and slipping them in his pockets. He was just shrinking several decoy detonators when Fred joined him. "We've got to get moving. Patronus. Death Eaters at Tilbury, we've got to go."