on the flight over to Kauai regarding an expert group of skiers, very knowledgable on avalanches. 3 end up dead due to an avalanche. While hiking with another couple up a steep hill near Wailua River the husband who was overweight and out of shape was really struggling, I suggested he and his wife head back down and we would hike another 10-15 minutes up and then meet them at the car. Both wifes said no Johnny can make it, I remembered the article when nobody would speak up and I just said no turn around and we will meet you at the car. They did, we hiked for another 10 minutes and then went back down and met them at the car and everybody was happy. I probably would not have spoken up if I had not read the article, so it is very easy to get stuck in Groupthink.