Just sit tight. Reinforcements should be here soon. Hopefully nothing happens before-" Lightning crackled overhead. The wind picked up with a vengeance. Worksheets flew into the Grand Canyon, and the entire bridge shuddered. Kids screamed, stumbling and grabbing the rails. "I had to say something," Hedge grumbled. He bellowed into his megaphone: "Everyone inside! The cow says moo! Off the skywalk!" "I thought you said this thing was stable!" Jason shouted over the wind. "Under normal circumstances," Hedge agreed, "which these aren't.