By 8:30 p.m., darkness had enveloped K2. Members of the Norwegian group - including Lars Flatø Nessa and Skog, who had both summitted two hours after Zerain - had almost navigated the traverse leading to the Bottleneck, when a serac (a large block of glacial ice) broke off from above. As it fell, it cut all the fixed lines and took with it Skog's husband Rolf Bae, who had abandoned the ascent only below the summit, telling Nessa to look after his wife, as he waited for her. Nessa and Skog continued descending without the fixed lines, and managed to reach Camp IV during the night.