"The whole thing. I need the whole thing. What am I going to do with a pack of crackers and a length of wire?" He means, really. Sheesh. "Well..."
Harry. No, don't stop in place to think about it. RUN. "No, no, no, no. I need the whole thing. And a perimeter around me so I can make this work." Make what work, he's apparently not going to tell you. But aren't crazy hand gestures while you run fun.