Северянка
Так и написано. Как я понял, они в процессе драки слегка поколдовали.
"A short exchange of blows left Arthur with a black eye and Lucius – with a toilet seat around his neck – stumbling into the dark haired girl and then Ginny and her friend.
...
Lucius scowled twisting away and stalking down the street throwing the toilet seat off to the side."