Snape dodged and rolled, ending behind the same table Hermione was using for cover. She flicked her wand, trying to disable the woman across the room, who was currently shrieking and firing off hexes with the rapidity of an automatic rifle.
"I told you we shouldn't've come," Severus growled, taking his own turn, which was easily blocked.
"Only thought it polite; we are engaged," Hermione gasped, leaping for a chair as the table exploded into splinters. "How in the hell does she do that?"
"She's my mother, Hermione," he replied dryly. "Who in the hell do you think taught me?"