Long traverse on the backside of the boulder of Pourquoi Tant de Haine? (orange n°34), along the 25 Bosses path, in between Querelle de Chapelle and Coup de Torchon. Sitstart without crash-pad on the right of the South face, traverse to the left on the ledge of slopers, pass the angle, continue in the main face, reach Paul Haine (retour) and exit at that one via the slab of the left facet.