Hikers and skiers rest near the top of Mount St. Helens on May 3, 2019.

We summited under a cobalt blue sky and a fierce spring sun. The steep snow-covered terrain eased, and we stood on a flat(ish) spot, about the size of a basketball court.

Mount St. Helens is 8,366 feet tall, and on a clear day, as this one was, you can see up and down the Cascade Range, volcanic sentinels dotting the West Coast.

After five hours of effort, the view was a welcome reward. My climbing partner and I rested.

We weren’t alone in our admiration. The top of the mountain was crowded with about 30 other climbers. Many were in their T-shirts, as I was, basking in the sunlight. I saw a few cracked beers and lots of smiles.

It felt like a summer party, aside from the thousands of feet of air on all sides.

We’d ascended a route known as the Worm Flow route; it’s the most direct (and easiest) line up the mountain in the winter and spring. It’s a five-mile path that gains about 5,700 feet. The route’s name comes from its shape: raised tubes, remnants of the rivers of lava that coursed down the mountain’s southern flank during an eruption. The lava left sharp ridges of volcanic rock that look as if gigantic worms (“Dune,” anyone?) burrowed down the mountain.

The violent force necessary to create these flows is unimaginable. But signs of that eruption were all around. To our north, lay the crescent shaped rim of the volcano’s caldera. The lava contained beneath that dome still regularly sends steam and sulfur into the air.

But, on a warm May day last year, violence and change were far from my mind.

We ate. We chatted with some of the other sunbathing climbers and then we prepared for the truly fun part.

Skiing down.

Many, perhaps most, people hike up Mount St. Helens. It’s considered one of the easiest Cascade volcanoes to summit and requires little technical knowledge.

However, there is a better way. Skiing up using specially designed “skins” on the bottoms of your skis to grip the snow.

Once on top you can ski down, avoiding a long, slow slog downhill.

This was our plan and the driving force behind our climb. Views are enjoyable. Good spring skiing is sublime.

I’d borrowed a friend’s pair of skis. An ultralight design meant for long days of uphill travel. This trip was my first time on them.

They were like many other pairs of skis I’ve used, except for in one key difference: They did not have brakes. Ski brakes are twin spring-loaded pieces of metal that dig into the snow. As the name implies, they keep your skis from rocketing down the hill.

These skis I’d borrowed had tethers – that is a cord that clipped to my ski boot. They were a bit awkward to put on, especially when wearing gloves.

And so, slightly tired from lunch and overly relaxed, I didn’t clip my ski to my boot, instead setting it down on the nearly flat surface of snow and ice.

Nearly flat doesn’t cut it.

It started slow, but within a second or less my ski had gone beyond recovery and was rocketing down the steep slope.

Four people were hiking up this hill. I screamed down at them, aware of the damage an out-of-control ski can do. The other 30 or so on the summit yelled, too.

The ski picked up speed, skipping over undulations in the snow, headed toward the distant group.

About halfway down the steepest section the ski, through a miracle of physics, hit a particularly large bump at an angle, flew into the air, rotated 180 degrees and landed upside down.

This accomplished two things: Most importantly, it sent the ski away from the four folks hiking uphill.

And second, the binding bit into the snow, and the ski slowed and eventually stopped about 400 feet downhill from me.

I’d been incredibly lucky, twice.

Past the immediate fear of hurting or killing someone, I felt shame. A stupid and 100% avoidable mistake.

I hiked down, retrieved my wayward ski and skied back to the car without incident. I apologized to the four people hiking up. They gave me frosty glares, as I deserved.

The entire incident still haunts me. I was rattled and shocked by my lapse in attention. My arrogant disregard for gravity. I still shudder thinking about how it all could have happened with just a little less luck.

I’d like to think I’m more careful and attentive. And I’ve thought a lot about how the combination of things (good weather, lots of people) made it easier for me to lower my guard and forget the power of gravity.

But, the full meaning of the experience didn’t come into focus until I started reading about the 1980 eruption of Mount St. Helens.

This mountain, this massive chunk of rock and dirt, changed overnight. How disorienting! What an affront to our presumed control of the natural world.

And I saw echoes of my own arrogance in the press reports. In the spring of 1980, most people couldn’t imagine the scale of the upcoming Mount St. Helens eruption, seeing it instead as “an entertaining sideshow,” as Jim Kershner, a historian and Spokesman-Review contributor wrote recently.

All of which, in my mind, comes back to geologic time.

Because things move slowly, we believe they aren’t moving at all.

Because we move quickly, we fail to see the signs of change: whether it’s shifting snow and ice or a warming climate or an untethered ski on not quite flat terrain.