In reply to gourd:
If either of them fell it is POSSIBLE that both might die!
On the other hand - it is easy ground in (what appears to be) good conditions...
Also, the photo just shows the situation - not their experience, background, confidence, competence, rapport, willingness-to-accept-risk etc etc
Maybe they carried out an instant risk assessment - and concluded that, although the consequence of a fall was dire, the risk of falling was small enough to continue through the risky section smoothly and quickly (for that particular pair on that particular day).
I think that, in general, us British people struggle with the dynamic risk assessment process - and the additional factors/risks (not just falling) that are involved when moving up to bigger hills.
I guess what I'm trying to say is that nothing comes for free - if you want to get onto a fabulous alpine arete then you will have to accept that some risk will be involved. How you deal with that risk will depend on your experience and state of mind!