But at around 4 in the afternoon Nacho shouted me from the other tent. He told me that Passan and Migma were feeling unwell, very unwell. They had the beginnings of altitude sickness. They couldn breath, and they were exhausted. No problem! We didn hesitate to give them oxygen because their saturation was extremely low. Pablo gave us instructions from base camp, and we did exactly what he said. The oxygen gradually made them feel a lot better, but we were all very, very worried. It was clear that they had to go back down as soon as possible. Night fell. We were thoroughly intending to set off for the summit at around 10 o but things started to change. Migma and Passan needed to go back down straight away, but as soon as night fell, a strong wind began to blow.