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)