Lucius said nothing at first, but instead glanced about the crowd, all who seemed intent on getting past the Three Broomsticks to head up to the school. Lucius noted the smaller buildings across the street, and made a decision.
"I don't know if there is time, but I have an idea," he said, "Stay here. I'll be right back," he said, stepping away from her, further into the shadows of the shop and reaching for his wand. He took it out, and daring to be seen, raised his wand and pointed it directly at the house across from the bar, casting a non-verbal spell.
"Expulso!" filled his thoughts with a roar and he watched with some satisfaction the small house exploded. He turned to Narcissa, and stepped back to her side, "There's the distraction. Now what?" he asked, thinking of perhaps apparating to Peter and just yanking him back inside the bar and spiriting him away.