My script breaks when other people in the Team Create use it?

This collection of scripts makes the correct bodyparts visible, plays an animation, then fires a raycast and slows down whatever got hit. When I run it, it works fine. But when other people in my team create session run it, the animations are broken and the raycast doesn't fire. Why could this be happening?

Localscript to play animation and fire server event:

local player = game.Players.LocalPlayer
local char = player.Character or player.CharacterAdded:wait()
local humanoid = script.Parent:FindFirstChild("Humanoid")
local ammo = script:WaitForChild("Ammo")

local barrel = humanoid.Parent.AnimPistol:WaitForChild("Barrel")
local grip = humanoid.Parent.AnimPistol.GAssembly:WaitForChild("Grip")
local trigger = humanoid.Parent.AnimPistol.GAssembly:WaitForChild("Trigger")
local gun = humanoid.parent.AnimPistol
local arm = humanoid.Parent:WaitForChild("Right Arm")

barrel.Transparency = 1
grip.Transparency = 1
trigger.Transparency = 1

local origin = script.Parent.AnimPistol.Barrel
local bFolder = game.Workspace.Bullets
local bulletFiredEvent = game.ReplicatedStorage.bulletFired

barrel.PointLight.Enabled = false
local canShoot = false
local coolDown = true
local keyBind = "f"

local mouse = player:GetMouse()

mouse.TargetFilter = bFolder

mouse.KeyDown:Connect(function(key)

    if key == keyBind then

        if ammo.Value ~= 0 and coolDown == true then

            canShoot = true

        end

        if canShoot == true then

            canShoot = false
            coolDown = false

            local animation = humanoid:LoadAnimation(script.Animation)
            animation:Play()

            local function antiTransGun(part)

                if part and part:IsA("BasePart") and (part == barrel or part == grip or part == trigger) then 

                    part.LocalTransparencyModifier = part.Transparency
                    part.Changed:connect(function (property)    

                        part.LocalTransparencyModifier = part.Transparency

                    end)

                end

            end

            for _,v in pairs(gun:GetChildren()) do

                antiTransGun(v)

            end


            arm.LocalTransparencyModifier = 0
            barrel.Transparency = 0
            grip.Transparency = 0
            trigger.Transparency = 0

            animation:GetMarkerReachedSignal("Cock"):Connect(function()

                --play cocking sound

            end)

            animation:GetMarkerReachedSignal("GunShot"):Connect(function()

                barrel.PointLight.Enabled = true
                barrel.Attachment.Flash.Enabled = true
                barrel.Attachment.Smoke.Enabled = true

                local mousePosition = mouse.Hit.p
                local originPosition = origin.Position

                bulletFiredEvent:FireServer(mousePosition, originPosition)

                for i = 0, 3 do

                    local zoom = math.random(70, 90)
                    workspace.Camera.FieldOfView = zoom
                    wait()
                    workspace.Camera.FieldOfView = 70

                end

                --play shoot sound

            end)

            animation:GetMarkerReachedSignal("UnFlash"):Connect(function()

                barrel.Attachment.Flash.Enabled = false
                barrel.PointLight.Enabled = false


            end)

            animation.Stopped:Connect(function()

                barrel.Attachment.Smoke.Enabled = false
                arm.LocalTransparencyModifier = 1
                barrel.Transparency = 1
                grip.Transparency = 1
                trigger.Transparency = 1

            end)

            ammo.Value -= 1

            wait(5)
            coolDown = true

        end

    end

end)

Regular script that handles the raycast

local bulletFiredEvent = game.ReplicatedStorage.bulletFired
local bulletFolder = game.Workspace.Bullets
local debris = game:GetService("Debris")

local range = 999

local function createBeam(origin, direction)

    local midpoint = (origin + direction / 2)

    local part = Instance.new("Part")
    part.Parent = bulletFolder
    part.Anchored = true
    part.CanCollide = false

    part.Material = Enum.Material.Plastic
    part.BrickColor = BrickColor.new("Black")

    part.CFrame = CFrame.new(midpoint, origin)
    part.Size = Vector3.new(.075, .075, direction.magnitude)

    for i = 0.75, 1, .01 do

        part.Transparency = i
        wait(.1)

    end

    debris:AddItem(part, 3)

end

bulletFiredEvent.OnServerEvent:Connect(function(player, mousePos, originPos)

    local direction = (mousePos - originPos).Unit * range

    local result = workspace:Raycast(originPos, direction)

    if result then 

        local character = result.Instance.Parent
        local humanoid = character:FindFirstChild("Humanoid")

        if humanoid and humanoid ~= player.Character.Humanoid then

            humanoid.WalkSpeed = 2
            wait(5)
            humanoid.WalkSpeed = 16

        end

    end

    createBeam(originPos, direction)

end)

Note that the animation is not created by the group, but rather by myself. Uploading it to the group makes it wonky. I'm trying to figure out why I'm the only person that can get it to work.