I knelt down by one of the grizzly's tracks. It was larger than my hand where his pads had pushed the mud out wide. I pressed my palm into the hollow of his track and stretched my fingers out to touch his claw marks one by one. My scalp tingled. "Sure was a big one, wasn't he?" I spun around and something knocked me flat on my stomach. Before I could roll over, a heavy knee pinned my shoulder to the ground and a hard hand yanked my head back by the...