When Rainsford washes ashore on Ship-Trap Island, he does not awaken until it is afternoon; consequently as he explores the island, he finds himself exploring at twilight. Then, he spots the chateau high on a cliff that was set on a high bluff that dives down to "where the sea licked greedy lips in the shadows."
Likewise, the jungle is ominous. When Rainsford creates a complicated trail though the jungle after dark, Geeral Zaroff pursues him; and, then, he saves Rainstord for another day, and Rainsford learns the meaning of terror. On the next day, Rainford creates a place that is certain to kill Zaroff, but it does not, and Rainsford is yet "a beast at bay." Still, he is able to escape to the sea and return to deal with Zaroff for his freedom. Truly, both the mansion and the jungle are forces that Rainsford must face, for in each Rainsord is "still a beast at bay."