**Most of this is nonsense, so don't take the methods to heart if you do have a phaser and wish to know how to use it (I will not be held responsible for my readers' phaser injuries and/or deaths so please do not send me your medical bills!)... That is all.
~FanTazy**
"Come here," McCoy orders as he and the girl step into an empty room. "This used to be a storage room, but we've never really used it. Instead, we've renovated it into a target practice room."
The girl raises an eyebrow as she scans the completely empty white room. "I hate to break it to you, Bones, but this room is completely empty. What am I supposed to use as a target?"
McCoy walks towards a monitor built into the wall and taps the screen, allowing a whirring sound to fill the room.
Suddenly, the roof of the room opens up and several plastic 2-dimensional dummies lower into the room. Three begin to move whilst two remain stationary.
The girl looks over to McCoy who raises his hand to the dummies. "Are they good enough targets?" he asks sarcastically before approaching the girl who clutches the gun's grip in one hand. "Alright, so first you need to hold the phaser in both hands. It helps you to keep a steadier aim and less likely of a chance to misfire."
The girl takes hold of the gun in both hands, overlapping them.
McCoy shakes his head and points to her hands. "You need to have your dominant hand closest to the trigger, with your less dominant further down the grip." He watches as the girl fumbles around to get her hands right without accidentally firing. Once she gets it, he stands directly behind her placing his hands on her shoulders. "Okay, now you need to try aiming," he speaks gently to her as he traces his hands to her elbows and raises them accordingly. "You need to make sure your line of sight isn't blocked by the phaser, and your arms aren't sagging." McCoy steps closer to her, almost resting his cheek against her ear, as he encourages her to stretch out her arms. "Your left arm's your dominant hand?"
She nods quietly to him, afraid any words out of her mouth will choke from the close proximity.
"Alright, so hold the phaser slightly to your right so your left hand is stretched out and your right arm is a little slack. This'll make it easier to compensate for the recoil and withdraw it when you need to."
McCoy helps the girl motion her arms back and forth from aiming and withdrawn. "You got it?" He asks, looking at her face which seems focused intently on the phaser in her hand. He releases her arms and steps back from her a few inches as he speaks. "Alright, make sure your eyes are on the target and the phaser is following your line of sight." She nods as she aims the phaser in front of her. "Now try shooting one of the stationary targets."
She aims for the one on the far left and presses the trigger on the grip. The phaser fires towards the dummy and recoils in her hand, causing her to jump but still keep a grip of the gun. She watches as the dummy is knocked off its balance and begins to spin to reveal a reasonably sized hole in its left shoulder.
A satisfied smile grows on her face and she turns to McCoy. "Well, at least I hit the target."
McCoy folds his arms. "Not bad. But you only gave him a shattered clavicle and minor burning." He walks up to the girl and takes hold of her hands from behind and makes her aim at the same dummy she had fired at. The doctor places his hands over hers gently. "Aim for the head when killing, and the heart when stunning." He forces the girl to fire the phaser, shattering the left side of the torso where the heart would be. "Use stun when needed. Only kill when you have to. Firing at the heart allows the stun to trigger the symptoms of cardiopulmonary arrest. Most times, it won't be fatal, but will leave them stunned for a longer period of time."
"Most?" the girl repeats, turning her head to see his dangerously close and quickly turning to face ahead.
"Most being the ones with no heart problems. Cardiovascular disease, Tachycardia, Bradycardia…"
"Okay, I get it," she stops the doctor from indefinite listing. "Heart problems means death by direct stun to the heart, right?"
He nods. "Right." He pulls himself away from the girl and steps towards the monitor. "Do you think you can handle the moving targets?"
The girl looks to see the dummies in the background moving from side-to-side and swallows hard. "Y-yeah, I'll give it a shot."
McCoy watches intently as she raises the phaser in front of her and aims to one of the mobile targets. She breathes slowly and steadies her hand as she aims.
Her finger pushes the trigger.
McCoy gives her a surprised look as the dummy spins violently with signs of damage to the head. "Now that was unexpected," he admits to himself in a whisper.
The girl watches as the tip of the phaser remains out on front of her. The dummy eventually comes to a stop and swings ominously to one side as one of the struts attaching the dummy to the mechanism is shattered.
She pulls the phaser in and releases her right hand from it in awe. "I got a direct shot…"
"How the hell did you do that?" McCoy asks from the side. "Even Jim couldn't get the moving target on his first try!"
The girl looks to McCoy, then to the phaser, and then to the dummy. "Maybe… I've fired one before," she speaks up, not quite knowing herself how she managed to pull it off. "Maybe it was instinctual."
McCoy growls. "Instinctual my ass. Seeing you do that makes me a little afraid to find out who you really are…"
"Attention all crew members!" A voice over the intercom announces. "This is your captain, speaking. We have arrived at our destination, could Mr Scott and doctor McCoy meet me in the transporter room immediately! Bones, take the girl with you. Kirk out."
McCoy and the girl look at one another and nod. The doctor heads to the door as the girl slides her phaser into her holster before following McCoy to the transporter room.