This video was shot on the Aiguille du Midi Arete on Mont Blanc and captures a very scary moment in which a climber descending from the summit slips and nearly falls to his death on the knife-edge ridge. Thankfully he self arrests very quickly, but had he gone in either direction of the ridge, it would have been a disaster. Definitely a frightening moment with thankfully a happy ending. A good reminder of why knowing how to self arrest is so important.