Wind Boomed

In Dead Leaves and Explicit Pathetic Fallacy, we recognized extremely powerful use of the literary device of "pathetic fallacy" in a passage of Poul Anderson's A Knight Of Ghosts And Shadows. Here it is again. Although Dominic Flandry basically approves of the institution called the ispravka, he realizes that its use on this occasion might help the enemy. When Flandry articulates this concern, the author automatically underlines his words with a reference to the winter elements:

"'Maybe the firebrand who instigated that, uh, ispravka is a Merseian himself, in human skin.'
"The wind boomed between walls."
-Poul Anderson, A Knight Of Ghosts And Shadows IN Anderson, Sir Dominic Flandry: The Last Knight Of Terra (Riverdale, NY, 2012), pp. 339-606 AT XVII, p. 555.

Why did wind boom just then? Of course, we understand that it is booming anyway. But the author mentions it because it is appropriate that the threat from the heard but unseen wind parallels the threat from clandestine conspirators and enemies of the status quo.