Officers storm through the doors of a church and are met by an armed man and victims screaming for help.
A shoot-out ensues and the armed man falls to the ground.
"He's got a gun!" ... "Back there!" ... "I've been shot!"
This is just some of what the officers hear as they make their way through the church, following the sound of gunfire.
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Wednesday's training exercise was staged, but judging from the officer's reactions - the serious looks on their faces, how they drew their weapons and fired - the drill prepared them to face a gunman.
The training simulated responses to an "active shooter" situation - like what happened at Virginia Tech and other schools - where officers put aside some of the normal protocol in hopes of apprehending a shooter before he kills again, said Lt. Brian Boling of the York County Sheriff's Office.
"In these situations, every gunshot can be a life," he said. "The goal is to follow the sounds of those shots and get to the shooter or shooters as quickly as possible."
Sheriff's deputies and officers with the Clover, Fort Mill and Tega Cay police departments participated Wednesday during a week of training that included classroom instruction and practical exercises open to all agencies in the county.
"This is where we get a chance to make mistakes and learn from them - and hope they don't happen in real situations," Boling said.
In Wednesday's exercises, the officers were responding to a simulated situation at a church. They used a building under renovation by The Broadcast Group on the former PTL property in Fort Mill Township.
Deputies were armed with weapons that looked and acted like what they might carry, only the barrel was slightly modified, Boling said. They were shooting plastic, paste-filled bullets.
But the sound was real.
The echoes of gunfire resonated throughout the building. Behind the corners, in dark mirror-lined rooms, officers encountered shooters and victims, giving misdirection and distraction as in a real situation.
"The sound of gunfire has an effect on the officer, even when they know it's a drill. It's still stressful," Boling said.
Sheriff's Lt. Chris Blevins, who acted as an armed shooter for part of the drill, agrees.
"It makes your adrenaline go up, for sure. There's a lot happening at once. There's yelling. And it's still a gun. You are getting shot at. You do have to try to protect yourself. It can sting a little," Blevins said.
He applauds the Sheriff's Office for ongoing, realistic training that keeps him and other officers prepared for many situations. Some of the training he's done in the past, he has been able to directly apply to incidents he's responded to.
Blevins said he hopes he doesn't encounter an active shooter situation in York County, but knows that he's prepared if he does.
See video of the training below.