In the great moonlight clearings I slunk along
among the shadows on the margin. In the
jungle I crept forward, stopping with a
beating heart whenever I heard, as I often
did, the crash of breaking branches as some
wild beast went past. Now and then great
shadows loomed up for an instant and were
gone-great, silent shadows which seemed to
prowl upon padded feet.
Why would the author put these details at the
beginning of the story?