FORT MILL -- Gunfire erupts and an officer screams, "I'm hit!" as he lies on the pavement.
He radios that he's out of ammunition and needs help.
His backup moves in quickly, bypassing the wounded and the swarm of a panicking crowd.
The pursuing officers don't look for their injured comrade or any other victims -- they look for the shooter. Another person falls every 15 seconds, and there's no time to stop.
They find the gunman and open fire until he's down.
When the scene is clear, officers are debriefed -- near an amusement park basketball game.
This scenario was repeated numerous times this week at Carowinds. From Monday through Friday, the amusement park allowed officers to scramble amid roller coasters and fire paint pellets at one another as they practiced their response to what authorities call an "active shooter."
This type of gunman fires upon people in a public place and doesn't plan to survive the attack -- as was the case at Virginia Tech and at Columbine.
York County Sheriff's deputies train for this type of situation every year, though this week was the first time they've trained at Carowinds.
Traditionally, officers have trained for these events at schools and other indoor facilities. The park presented a new set of challenges: more distractions and more places where suspects could hide.
Most police training tells officers not to rush into dangerous situations, to cautiously look around corners and to make methodical approaches.
"When you have an active shooter, all that goes out the window," said Lt. Brian Boling, training coordinator for the sheriff's office.
Under these conditions, police are trained to follow the sound of gunfire until they find the shooter and take him down.
Because this kind of rampage claims a life about every 15 seconds, Boling said, officers must ignore the dead, wounded and fearful people they pass and get to the gunman.
This week, 160 sheriff's deputies and a few Rock Hill Police officers went through the training.
One was deputy Joe Bennett, who has been in law enforcement for more than 10 years, seven of them with York County. Bennett said it's important for officers to get this training, though he has never used it.
"Fortunately," he said.
Overall, Boling said he was pleased with what he saw but said improvements are needed. Specifically, he said, officers aren't staying close enough to one another during their search for the shooter. That will be addressed in next month's training.
"If you don't train for it, it'll happen," Boling said, referring to an "active shooter" situation. "Train for the worst, hope for the best."