Script is working but another players cant see the damage?

When i attack a dummy another player doesnt see how many damage i did on that dummy, but i can see it. On my screen, the dummy's health is going low when i hit it, but on another players screen, its not going low. Its staying still. And i cant see what another player done too.

local Attack = true


script.Parent.Activated:Connect(function()
wait(0.1)

if Attack == true then      
Attack = false  
local character = script.Parent.Parent
local Humanoid = character:WaitForChild('Humanoid')

repeat
wait()
    until character:FindFirstChild("HumanoidRootPart")

local part = Instance.new("Part", game.Workspace)
    part.CanCollide = false
    part.CFrame = character.HumanoidRootPart.CFrame
    part.Size = Vector3.new(7.3, 4 ,3)
    part.Transparency = 0.5

local Weld = Instance.new("Weld", part)
    Weld.Part0 = character.HumanoidRootPart
    Weld.Part1 = part
    Weld.C1 = CFrame.new(0, 1, 2.5)
    Weld.C0 = CFrame.new()

    part.Touched:Connect(function(p)


    local hum = p.Parent:FindFirstChildOfClass("Humanoid")
         if p.Parent.Name == ("Mob") then
            if script.Parent.CanDamage.Value == true then

                script.Parent.CanDamage.Value = false
                    hum:TakeDamage(math.random(9,23))
                wait(0.15)
                script.Parent.CanDamage.Value = true

            end

        end
    end)


wait(0.15)
part:Destroy()
wait(0.5)
Attack = true   

end

end)

Is it a problem of a LocalScript? When i do this on normal script, i can damage on studio but not in normal game. If i do it on LocalScript, then this problem happening.