NEW: Idaho Sniper’s Potential Motive Revealed After Chilling Social Media Is Discovered

The grandfather of Idaho shooter Wess Roley thinks he knows what may have set his grandson off to the point that he decided to take the lives of two firefighters and nearly kill a third with a high-caliber rifle.

Roley, 20, presented no suspicion to his family about his plans, carried out Sunday, to set a brushfire and gun down firefighters who responded to the blaze. In fact, the young man had ambitions of one day becoming a first responder himself, his grandfather revealed.

“He actually really respected law enforcement,” the alleged shooter’s grandfather, Dale Roley, told NBC News.

“He loved firefighters. It didn’t make sense that he was shooting firefighters. I know he had been in contact to get a job with a fire department. He wanted to be part of a team that he sort of idolized.”

The Roley family lives in Coeur d’Alene, a small town in Northern Idaho near Canfield Mountain, where the shooting took place. Shortly before he began firing on the town’s firefighters, Roley made a chilling final post on Instagram.

“I’m going hunting,” he wrote, quoting a song while showing off a picture of himself with hunting face paint and a balaclava.

Daley Roley speculated that the height of his grandson, who stood 5’8″, may have prevented him from qualifying for a job with the Coeur d’Alene Fire Department.

“Maybe he got rejected or something,” said the stunned older man.

Online amateur sleuths originally suggested that Roley’s shooting may have been related to the Aryan Nations, a white supremacist organization formed in nearby Hayden Lake and whose organization was the victim of an area fire exactly 24 years ago to the day.

Roley’s grandfather described his grandson as often “nervous” and “high strung,” adding he was “kind of a loner” who stood apart from his former high school classmates.

However, he felt that those are “normal issues for kids these days” and didn’t think anything more about it.

“I feel real terrible for those killed,” he added.

In a followup post on social media, Daley Roley expressed his sympathy for the firefighters who were killed.

“I would like give my Condolence’s (sic) to all those family members who were Unfortunately Victims of yesterdays Crimes, Those good Brave Firefighters were just doing there Job they did not deserve this! My Condolences!” he wrote.

Harrowing audio from Sunday night’s shooting reveals the fear in the voices of firefighters who arrived to battle a blaze, only to find themselves scrambling for cover to try and save their own lives.

“Send law enforcement right now! There’s an active shooter zone,” one responder could be heard crying out, the Daily Mail reports.

“Everybody’s shot up here!” the firefighter continued, saying his battalion was “pinned” down by gunfire.

Moments later, he could be heard pleading with new arrivals to stay away from the scene.

“Stop. Do not come up here,” he can be heard shouting.

“‘It’s clear to me that this fire was set intentionally to draw us in,” he goes on in the recording. “I would recommend that our units, all of our firing units, escape further down the pavement towards town, maybe a half a mile or so to a safe staging area.”

He urged dispatchers to send “multiple ambulances” to the scene after colleagues were hit.

Two firefighters were pronounced dead at the scene while a third is “fighting for his life” after undergoing emergency surgery. On Monday, doctors upgraded his condition to “stable,” according to Fox News.