Draco had disappeared back into the room at the back of the shop, because it was pleasant and set up and professional looking and he was happy with it. Standing in the shop looking at the empty shelves was giving him some kind of mild anxiety, not only because he had no stock, but because it brought home the reality that he was, for some reason, opening his own shop.
The knock on the door startled him, his initial reaction was to sit still and hope whoever it was went away. But of course they weren't going to do that. Of course not. At the voice and the obvious implication that it's owner was wandering around the interior of the shop, Draco stood up and went back out, looking at Dennis with some displeasure. He seemed harmless, but that meant nothing.
Draco's gaze flicked to the wayward parchment on the floor, taking two steps over to it and stooping to pick it up. He skimmed the words on it, then looked at Dennis.
"There's a spelling mistake in the third line," he said, holding the article at arms length in Dennis' general direction.