Lenz kills the Nuck dog — "A first-floor light in the house…"
A first-floor light in the house across Brainerd lights up and backlights a figure in a sort of suit and metal wheelchair sitting right up next to the window in the sideways way of wheelchairs that want to get right up next to something, scanning the street and Nuck-swarmed yard.
Context
The whole grotesque set-piece — Lenz cutting a dog's throat, a household of Québecois pouring out to grieve and give chase — turns out to have been under real surveillance the entire time. As the yard fills, a light comes up across the street and backlights a suited figure in a metal wheelchair pulled sideways to the glass, "scanning" the chaos; then "Another wheelchaired form has appeared just behind and to the right of the first seated backlit form across the street." Two watchers, motionless, positioned opposite a Hawaiian-blaring Nuck house at 412 W. Brainerd — the A.F.R.'s signature wheelchairs (the raw names only the chairs, never the org; the identification is the novel's standing wheelchair=A.F.R. tell) casing a Canadian household in Enfield's orbit. They register the killing and the flight and do not move: professional observation, filed and unspent, while the amateurs thrash below.