In reply to jon:
> . I'd guess that you ended up somewhere between the two and that the in situ belays, as webster and alex suggest, might well be from climbers who've either made the same mistake or indeed tried to descend too directly.
voi contamine labrunie heads pretty much straight up, but when we did it, there were times when we thought the pitch wasn't quite right and we may have just linked someone abseil pitches, but was certainly in the right direction. The OP could have been just 1 groove line to the left or right and as you say you'd just hit a cul de sac.
As an aside I think it's a great little mountain, once you get a feel for where you are going, having been on it 5 times now and the hut is passable too.