GR translation: if it just keeps on, rising to a peak

[Mike Jing]

P21.28-33   You’d be walking on the street, in bed just dozing off
suddenly here comes this farting sound over the rooftops—if it just
keeps on, rising to a peak and passing over why that’s fine, then it’s
somebody else’s worry . . . but if the engine cuts off, look out
Jackson—it’s begun its dive, sloshing the fuel aft, away from the
engine burner, and you’ve got 10 seconds to get under something.

"if it just keeps on, rising to a peak and passing over why that’s fine"

Here, "it" refers to the sound of the buzzbomb, the "farting sound",
is that correct?