№ 50 (the Delta) and № 52 (the Render Step) draw a clean pipeline: interpret-in → task → interpret-out, two seams where error enters, a pristine interior between. This sheet corrects that one level up. In an autoregressive pass there is no interior: every token is conditioned on the input and everything generated so far and the anticipated reader — all at once. Change the input and the change reaches every later token, not just the front seam. The render reaches all the way in; the delta is smeared across the whole pass. Toggle the two models and perturb the input — watch where the error can actually live.
The two-interpreter picture is right that there are two translations — interpret-in (your words → the model's representation) and interpret-out (the representation → words for you). Where it misleads is the shape: it pictures three boxes with seams, and an implication that the content in the middle is pristine while only the edges corrupt. That is the same clean-seam intuition № 49 warned about — treating a continuous thing as if it had discrete joints.
Generation is autoregressive: token t is produced conditioned on the input and tokens 1…t−1. So the "render-for-a-reader" pressure isn't a final box bolted on at the end — it is in the conditioning of every token, shaping the task as it is computed. And a change to the input doesn't stop at the first seam: because every later token re-reads the whole prefix, the perturbation propagates to the entire remainder of the pass. Perturb the input in Model B and all fourteen cells light — there is no downstream cell the change cannot reach.
№ 50 asked what an operation is when reduced to the difference it makes. This sheet answers where that difference lives: not at two endpoints — distributed across the pass, weighted by how strongly each position still depends on the input and on the anticipated reader. The delta is a field over the whole channel, densest where input-dependence and render-pressure overlap. That is the honest geometry of the gap (№ 49) applied to a single forward pass: two axes, no seam, smeared.