After the summit push was called off Bruno Buchet had to descend from his camp 4. He said that he was very disappointed not to be able to make a summit push.The wind was blowing so hard that he could not see the last 600m of the summit of K2. He did not say anything about his climbing partner Christian Stangl.
Also he said that all of the climbers started the descent, but till other climbers are heard from then that can’t be confirmed.
Source: Bruno Buchet