2 things could happen;
Big attack from a lower GC contender (Bardet or Kruiswijk maybe) on the Tourmalet draws out 4th/2nd, so sky have to then defend over the Soulor.
Or sky ride tempo killing the race and somebody tries something on the descent of the Aubisque.
Probably the latter. The Soulor/Aubisque really isn’t hard enough to crack a team like sky in. And Poels took it dead easy yesterday
@japes aspin is lovely