Pode não ser aparição. Aparição nos livros basicamente envolve aparecer do nada com um barulho alto
“They don’t need the car!” said Ron impatiently. “They know how to Apparate! You know, just vanish and reappear at home! They only bother with Floo powder and the car because we’re all underage and we’re not allowed to Apparate yet...”
Harry Potter and the Chamber of Secrets, Chapter 5, The Whomping Willow
Livros não falam em deixar um rastro de fumaça para trás, como mostrado em Ordem da Fênix e outros filmes.
O wiki de Harry Potter não é confiável, pois não tem citação. Mas tem o seguinte texto:
Death Eaters are shown physically collapsing into thick black plumes of smoke, shooting off into the sky, and being able to go wherever they want to, while doing this. Even though many people think this is apparition, it is not. It is just an ability that was given to the Death Eaters in the movie series.
Referring Apparition
Mas, ao contrário, Fred e George Weasley aparatam normalmente (como mencionado no livro) no filme Ordem da Fênix
Fred and George Weasley, near the beginning of the Order of the Phoenix film, show Apparition as it is shown in the books, by merely appearing out of thin air with a loud noise, usually startling the people around them like Molly Weasley
Referring Apparition
Até mesmo a página da Wikipédia para Magia em Harry Potter tem algo semelhante
In the Order of the Phoenix film, Death Eaters and Order members Apparate and Disapparate in clouds of smoke. Death Eaters appear and disappear in black smoke, Order members in white. In the film, both sides also appear to be able to "half-apparate" in which their bodies were made out of smoke, giving them the ability to fly. This is not canon to the books and probably just used for more cinematic, atmospheric purposes. Interestingly, both times Fred and George apparated and disapparated, they did it with a pop as in the books.
Referring Magic in Harry Potter
Eu acredito que é um feitiço diferente adicionado para efeitos cinematográficos. Não há cânones disponíveis para este feitiço.