tumbling , banging , feeling pain in every part of his body , hearing the land cruiser smashing down through the branches after him like a pursuing animal , and then tim 's shoulder hit the soft ground , and he rolled as hard as he could , and pressed his body against the trunk of the tree as the land cruiser tumbled down with a loud metallic crash and a sudden hot burst of electrical sparks that stung his skin and sputtered and sizzled on the wet ground around him .