Vs. Wall

"Tell me everything, Alice," I begged. "I don't understand. Why did you tell Jasper to stop Emmett, why can't they come help us?"
 "Two reasons," she whispered, her eyes still closed. "The first I told him. We could try to stop Edward ourselves–if Emmett could get his hands on him, we might be able to stop him long enough to convince him you're alive. But we can't sneak up on Edward. And if he sees us coming for him, he'll just act that much faster. He'll throw a Buick through a wall or something, and the Volturi will take him down."