Traverse Nose Climb to midway. Place your friend 2 1/2 in the obvious pocket above your head and make the same half mantle as Thumper. Once on the slab, look at the line of Thumper heading leftwards, shake your head and slope off up and right, re-joining Nose Climb below the final crack. Don't fall off the slap, it's a long way down.
Stewart Boutcher