i made a script that welds the hrp to a part when the part has been touched. it works, but if i delete the weld with the explorer, when i press the part nothing happends. why?

script:

script.Parent.Touched:Connect(function(hit)
	if hit.Parent:FindFirstChild("Humanoid") then
		local w = Instance.new("Weld")
		w.Part0 = script.Parent
		w.Part1 = hit.Parent.HumanoidRootPart
		w.C0 = script.Parent.CFrame:Inverse()
		w.C1 = hit.Parent.HumanoidRootPart.CFrame:Inverse()
		w.Parent = script.Parent
	end
end)

thx

Anonymous