The Secret Service leaped into action at a Trump rally in Reno, Nevada, on Saturday night, after a disturbance was serious enough for the Republican candidate to be rushed from the stage and whisked behind a curtain.

Two Secret Service officers quickly had Trump in their physical grip, while another ushered the trio backstage. In videos and tweets prior to the scuffle, Trump can be seen peering into the crowd, apparently noticing something that concerned him.

“These guys are fantastic — they don’t ever get enough credit,” said Trump of the Secret Service.

A “bald white guy in a hoodie” was led out of the location in handcuffs shortly after the disturbance, as The Guardian and other news outlets reported. He did not have a weapon, authorities said, although some in the crowd thought they heard someone yell, “Gun.”

As tensions continue to heighten with the election just days away, security measures at the candidates’ public events are even more crucial.

Members of the Secret Service protect the nation’s highest elected leaders and risk their lives every day for them — as well as for foreign dignitaries visiting the U.S. They also work major details at many facilities and the events that take place within them.

“The Secret Service has come under attack in recent years, but when it comes to personal protection, no one does it better,” Pennsylvania state constable Council Nedd told LifeZette Saturday night. “And I applaud Donald Trump for going back out onstage — no doubt over the objections of his protective detail.”

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In order to ensure a secure environment for protectees, the Secret Service integrates a variety of innovative technologies and maintains a highly skilled workforce, as their website explains.

The Secret Service works in tandem with highly specialized resources within their bureau that include the Airspace Security Branch, the Counter Sniper Team, the Emergency Response Team, the Counter-Surveillance Unit, the Counter-Assault Team, the Hazardous Agent Mitigation and Medical Emergency Response Team, and the Magnetometer Operations Unit.

John Brubaker, 55, said: “With their dark sunglasses and suits and straight faces, they were always heroes with a mystique when I was a kid, ready to protect a president to the death.”

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Related: Defiant Trump Stares Down Threat

Displaying an enviable toughness and commitment to lead this nation, Trump returned to the stage after the commotion. He told the crowd after the scare, “Nobody said it was going to be easy for us. But we will never be stopped. Never, ever be stopped.”

The event reminds Americans that being a candidate is serious business.

“That could have really been serious, and as contentious as this election has been, and as angry as Americans can get over politics, it would be horrible to have anything bad happen to any candidate,” said one Maryland father and grandfather who saw a televised replay of the frightening event.

Trump also thanked the Secret Service when he came back onstage, saying, “These guys are fantastic — they don’t ever get enough credit.”