The storyboard note on my Cold Chain voiceover script says: "The screen shows the two-stage clock and nothing else. No kitchen b-roll, no stock chef. The numbers 135→70→41 build as they are spoken, then hold." This is that screen, built.
"Hot food doesn't cool on your schedule. It cools on two clocks. Two hours to seventy, four more to forty-one. The thermometer decides, not the shift change. And if you miss the first clock, there's a recovery, one full reheat, and you start again. What there isn't, is rounding."
Every scene shows one number doing one thing, timed to where the narration would be. The deliberate pause after "rounding" gets its own held scene, because that's the line learners quote back in pilots — the audio needs room, so the screen holds still and gives it some.