I forgot to disclaim, so here it is: Me-own-nothing.
He was a man on a mission. He was unstoppable. He was the best at what he did, no; he was the best that ever lived. He was a bartender, and he was creeping along the back wall of his own pub humming a much mangled version of the mission impossible theme song to himself. Ginny Weasley stood and stared. A tall man with nervous eyes, wildly gesturing hands, and a creepily solemn face was not exactly who she had expected to find in Hogsmeade. Maybe she could place him being on the front lawn of Azkaban, or standing next to Sirius Black at a group therapy meeting. Hogsmeade? Again, not really.
She was a little more surprised when he straightened and looked directly at her.
"I've been waiting, Pygmy Puff. You're late." A flustered redhead started to protest, no, she was Ginny, don't you remember?, but was cut off rather abruptly when he launched himself at her and, screaming some odd battle cry (that strangely resembled the sound she fancied a scuba-diving bird might make) grabbed her wand-arm roughly and they disappeared in a billow of dust and cow-bells, much to the befuddlement of one Michael Corner, stalker extraordinaire.
Huh.
Aberforth, FOR YES IT WAS HE, flung out a hand to steady himself as he admired his own style. "Amazing what a little modification on the apparating process can accomplish, isn't that correct Miss Puff?" Ginny stared in abject horror. "We have traveled to the secret meeting-place that was much discussed!" Ginny suddenly understood what had happened in the last thirty-six seconds. "Oh! You mean that the Navaho rug we were standing on was really covering this hole, which our combined weight forced down a much too small pit to the secret meeting place. I misunderstood. I thought you were kidnapping me."
Aberforth looked at her as if she were completely insane. No, maybe he thought she was a little slow. "Pygmy, the leader suggested I meet you in person to convey most secret orders of a sensitive nature. I am your correspondent, THE BLACK MOOSE. In all caps, so it's dramatic. How on earth could you have misunderstood?"
She shrugged. "Well, I'm ready for the message now."
A halting breath was drawn, the two secret agents looked around nervously, never mind the fact they were thirty feet underground in a pit barely wide enough for the two of them to stand without touching. A midget could be spying on them. It's possible. They ARE careful people. Thorough, even. That was why no one else saw the diminutive girl pale at the sound of the nervous whisper "Your mom says to tell Harry Hi".