Why does my gun stop firing if i use debounce and shoot behind me ?

the gun script has magnitude < 1.33 in it and it makes it so that when you shoot behind you, the gun doesnt shoot. i added a debounce to the gun script and it works until you shoot behind or to the side of your character it stops shooting and it doesnt let you shoot forward again. it used to let you shoot forward again without debounce. i wanna keep the debounce so the gun can have a cooldown so it isnt spam fired. you have to re-equip the gun for it to shoot again, but it still breaks if you shoot to the side or behind your character.

Here is some of the script that is probably breaking the gun.

tool.Equipped:Connect(function(mouse)
	gungui:Clone().Parent = player.PlayerGui
	findBodyType()
	equipAnimation:FireServer(tool.ShootAnim)
	mouse.Icon = "rbxassetid://7262331135"
	local debounce = false
	mouse.Button1Down:Connect(function()
		if bullets.Value <= 0 or reloading == true then
		else
			if not debounce then
			debounce = true
			local head = game.Workspace[player.Name].Head.CFrame.lookVector
			local mouse = CFrame.new(game.Workspace[player.Name].Head.Position,mouse.Hit.p).lookVector
			difference = (head-mouse)
			local ray = Ray.new(tool.Handle.CFrame.p,(player:GetMouse().Hit.p - tool.Handle.CFrame.p).unit*300)
			local part,position = game.workspace:FindPartOnRay(ray,player.Character,false,true)
			if difference.magnitude < 1.33 then
				gunshotSound:Play()
				shootevent:FireServer(tool,position,part)
				bullets.Value = bullets.Value - 1
				wait(1)
				debounce = false
			end
		end
	end
end)