I'm trying to animate an arm coming out of the player but the problem is when i move its getting left behind anyway how to fix this?

here's my code;

local NewWeld = Instance.new("WeldConstraint")
	NewWeld.Part0  = Player.Character['HumanoidRootPart']
	NewWeld.Part1  = arm.PrimaryPart
	NewWeld.C0     = CFrame.new()
	NewWeld.C1     = arm.PrimaryPart.CFrame:toObjectSpace(Player.Character['HumanoidRootPart'].CFrame)
	NewWeld.Parent = arm
	NewWeld.Name = "HandleWeld"

local CFrameValue = Instance.new("CFrameValue")
		CFrameValue.Value = arm:GetPrimaryPartCFrame()
		
        local tweenInfo = TweenInfo.new(0.5, Enum.EasingStyle.Circular, Enum.EasingDirection.Out)
		
		CFrameValue:GetPropertyChangedSignal("Value"):Connect(function()
			arm:SetPrimaryPartCFrame(CFrameValue.Value)
		end)
	
		local tween = TweenService:Create(CFrameValue, tweenInfo, {Value = arm:GetPrimaryPartCFrame()*CFrame.new(0,-2,0)})
		tween:Play()
	
		tween.Completed:Connect(function()
			CFrameValue:Destroy()
			for _,v in pairs (arm:GetChildren()) do
			if v:IsA("BasePart") then
			local tweenInfo = TweenInfo.new(.5, Enum.EasingStyle.Circular, Enum.EasingDirection.Out)	
				local Goal = {}
				Goal.Transparency = 1	
				local Tween2 = TweenService:Create(v, tweenInfo, Goal)	
				Tween2:Play()
				Tween2.Completed:Connect(function()
					arm:Remove()
				end)
			end	
			if v:FindFirstChildWhichIsA("Decal") or v:FindFirstChildWhichIsA("Texture") then
			for _, t in pairs(v:GetChildren()) do
				if v:IsA("Decal") or v:IsA("Texture") then
					local tweenInfo = TweenInfo.new(.5, Enum.EasingStyle.Circular, Enum.EasingDirection.Out)	
					local Goal = {}
					Goal.Transparency = 1	
					local Tween3 = TweenService:Create(t, tweenInfo, Goal)	
					Tween3:Play()
				end
			end
			end
			end
		end)
Anonymous