In other words, don't assume you can ignore thunderclouds just because they're way off in the distance. If you can still count seconds between flash and crash, you have time to get to a safer spot. Do it, then wait until 30 minutes after the storm passes to head out again. They also advise against touching dissimilar objects, like rock and ground or tree and ground. Seek out clumps of shrubs or trees of similar height.
Tents offer no safety on open ground.
If you take all of the above-mentioned precautions, you'll increase your odds of staying safe. But if your hair stands on end, metal objects or wet rocks hum, and you notice the smell of ozone or a bluish tinge of St. Elmo's fire around boulders or a person, you're being warned. The clouds and ground are negotiating a target for a lightning strike, and you don't want to be it. Cover your ears to minimize hearing damage from thunder shock waves. They also acknowledge that when you're outdoors, there's no absolutely safe place to be.