The hair at the back of Percy's neck stood on end, for if he didn't know better, he'd have sworn it was Fred speaking to him from Ginny's face.
He maintained his dignity, however difficult it was, and didn't overtly react. "I am here to bring you home," he said simply and plainly - best so as not to say something he'd regret later. "You've been released into my recognizance."
He nodded to the officer standing next to him, who drew a wand to release a number of spells before finally opening the door. Percy waited - he would react when they weren't in the presence of other people, particularly those he worked with.