The mass shooting at the Borderline Bar and Grill in Southern California on November 7, 2018 is a tale of men and masculinity.

Lost in the carnage is a lesson we would all be advised to heed.

That lesson has little to do with the monster who took lives and everything to do with the men who saved lives.

The killer was 28 years old, lost, lonely, and living with mom.

He had been a regular at the Borderline Bar and Grill.

He knew that on Wednesdays, college, country, night, the place would be packed with kids, laughing and dancing.

He entered tossing smoke grenades, then unloaded his handgun, fitted with an illegal extended magazine into the crowd.

But there were other young men there too. One of them was 20-year-old Matt Wienerstrom.

In interviews, Wienerstrom looks like a typical college student, backward baseball cap, gray t-shirt, jaw scruffy with a few days' growth.

On camera he seems laconic, humble, willing to answer questions, neither eager for the limelight nor afraid of it.

As soon as he heard the shots, Wienerstrom told ABC News, he knew exactly what was going on.

He and some friends grabbed everyone they could and pushed them down behind the pool table, placing their own bodies on top of the girls.

One woman who was celebrating her 21st birthday, told Good Morning America.

There were multiple men who got on their knees and pretty much blocked all of us with their back toward the shooter, ready to take a bullet for every single one of us.

When the shooter paused to reload, Wienerstrom grabbed a bar stool and tossed it through a window.

He and his buddies pulled 30-35 people to safety.

After getting each group safely to the parking lot, Wienerstrom and his buddies went back for more.

A reporter asked Wienerstrom how he knew immediately what was going on in the loud, crowded bar.

Instinct, I guess, he said, I'm here to protect my friends, my family, my fellow humans, and I know where I'm going if I die, so I was not worried to sacrifice.

All I wanted to do is get as many people out of there as possible.

This is the masculinity we so often hear denigrated.

It takes as its duty the physical protection of others, especially women.

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