It's partly the descents (where someone like Savoldelli could pull back the better part of a minute on some riders over 10k of a technical route), but probably more so the areas where a group could work together, or where someone with better time-trialing ability could use those advantages to negate gains made on the climb. Given the likely much smaller size of the chase groups, and the fatigue level, the gains might not be quite as dramatic as when the sprinters' teams chase down an all-day break at the close of a stage, but the same principles apply.

If Rasmussen were to make it over the final climb tomorrow 2:00 minutes ahead of (just for illustrative purposes) Valverde, Evans, Mayo, Contador, Sastre and Kloden, I very seriously doubt Chicken would be able to win the stage.