Having lived in california for almost 50 years, And been to Yosemite Nat'l Park more then I can count, I can attess to the danger in the outdoors. As stated in the story, the Sierra Nevada mountains are made of granite. You might think Granite is tough, but is does errode and break down faster then a lot of other stone. The Face of Half Dome has had 100,000's people hike it. It is worn smooth and slick. By it's very nature it is dangerous even dry in the summer time. This goiing without saying that granite rocks in the Sierras, where ever there's a lot of foot traffic the granite is slippery. You can twist an ankle walking on flat level ground , if you step on worn slik granite.
As to the dangers of water, Think of it as liquid metal. The force that it contains is NO MATCH for man or beast. It is without doubt that it's the most deadly element on the planet. Fear it as you would Grizzly Bear, and Respect it for what it can do.. The life you save could be your own.

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