What is wrong with this mouse hold script?

This is a **local script **in a tool, it is only supposed to run while the tool is equipped and is meant to play an animation when the mouse is held for 4 (or more) seconds.

Absolutely nothing happens, no printing colour changing or animation playing, no output help either.

while script.Parent.Equiped.Value == true do -- There is a BoolValue called Equipped that
										-- Becomes true when the tool is equiped
		mouse = game.Players.LocalPlayer:GetMouse()
		
		mouseDown = false
		
		startedDown = 0
		
		-- `mouse` a Mouse object from, e.g., theLocalPlayer:GetMouse()
		
		mouse.Button1Down:connect( function()
		    mouseDown = true
		    -- From now on, held
		    startedDown = tick() -- Current time, in seconds
		end)
		
		mouse.Button1Up:connect( function()
		    mouseDown = false
			if tick() - startedDown>4 then
				script.Parent.Blade.BrickColor = BrickColor.new("Pastel Blue")
				script.Parent.Attack:Play()
				script.Parent.Blade.BrickColor = BrickColor.new("Medium stone grey")
			end
		end)
		
		while wait() do
		    if mouseDown then
		        print(
		            "Has been held for ",
		            tick() - startedDown,
		            -- Time between now and when `startedDown` was set
		            "seconds"
		        )
		    else
		        print("Not held.")
		    end
		end
	end