Where is foreshadowing in Leiningen Versus the Ants?

Foreshadowing in the suspense-filled "Leiningen Versus the Ants" comes mainly in the exposition of the story, but there are other incidences of foreshadowing near the middle of the story as the narrative develops.
The exposition of this story immediately reveals the circumstances that threaten Leiningen's coffee plantation. A Brazilian official has made a special trip to warn Leiningen of the aggressive approach of an army of voracious ants capable of destroying vegetation, beasts, and man. "Unless they alter their course, and there's no reason why they should, they'll reach your plantation in two days at the latest," the Brazilian tells Leiningen.
A self-assured Leiningen does not heed the official's warning. He thanks the man for "paddling all this way" to give him "the tip," however, he is not afraid. Leiningen tells the Brazilian that even "saurians" (crocodiles, lizards, and other reptiles) could not drive him out. In great frustration, the official throws up his arms. He shouts at Leiningen, accusing the plantation owner of being insane: "They're not creatures you can fight--they're an elemental--an 'act of God.' Ten miles long, two miles wide--ants, nothing but ants!" Undaunted, Leiningen argues that he can use his intelligence against any foe; besides, he adds, when he built his plantation and farm, he considered all that could happen, so he is ready for "anything and everything." Realizing that his warning is wasted on Leiningen, the official rises from his chair and informs the owner that if he and his workers do not leave the area, he will endanger not only himself but all his four hundred workers.
Leiningen accompanies the Brazilian official to the launch where the boat is moored. As he watches this boat move away, he sees the official waving his arms and still imploring him. As the man's voice grows dimmer, Leiningen hears, "You don't know them, I tell you! You don't know them!"
The official's words are a strong example of foreshadowing in Stephenson's exciting story that has as its central conflict one of Man vs. Nature. This foreshadowing suggests that Leiningen does not realize what he is up against with a mile long army of voracious large ants, as the battle against them will involve much more than he thinks. Later in the narrative, there is more foreshadowing of disaster as Leiningen surveys "twenty square miles of life-destroying ants," and he sees the vast army of ants ruining his plantation: "...that wide vista was being mown as by a giant sickle, leaving only the vast moving shadow."
It is then he realizes that the ants are a true "elemental," and Leiningen "could not free himself from a qualm of malaise...Hadn't his brain for once taken on more than it could manage?" At this point in the narrative, the foreshadowing of Leiningen's anxiety about what can yet occur starts to become a reality with the dangerous action that follows. After his desperate, but successful last attempt to save his plantation, a badly wounded--in some parts of his body so much flesh is eaten that his bones are visible--Leiningen finally realizes the strong significance of the Brazilian official's having called the voracious ants "an elemental."