Complacency will kill you
Levine starts off by talking about all of these very experienced and world renowned climbers fall to their death because of many stupid reasons.
One died because he had climbed so many times he was assured he did not need to clip himself to a safety line while going across the ladders through the Khumbu Icefall
Another decided to use a slightly worn harness that ending up snapping and he fell to his death
It is easy to become complacent when something seem routine. It will kill because unpredictable things can happen like an avalanche. To avoid complacency, you must keep yourself and your teammates in check. Complacency is also following the crowd and not knowing how to adapt.
This is why companies like Ford and Blackberry almost went bankrupt
She also talks about the Khumbu Icefall moving ice with many dangerous cervas that you get across by walking across shaking ladders. There are also 62 foot tall seracs that could fall at any time. It is also in between Camp 1 and Camp 2. Even though an Everest climber goes through it up to 7 times, she stresses that it is important that a climber does not to become complacent because it is very unpredictable terrain