Why does my sword do no damage sometimes?

This is the line of code i used and it's inside a server script

--//Variables
local tool = script.Parent
local player = tool.Parent.Parent
local char = player.Character
local hum = char:WaitForChild('Humanoid')

local debounce = false
--//Activated
tool.Activated:Connect(function()
    --//Animation
    local animation = Instance.new('Animation')
    animation.AnimationId = "rbxassetid://2690844038"
    local load = hum:LoadAnimation(animation)

    if not debounce then
    debounce = true
    load:Play()
    wait(0.5)
    debounce = false
    end
end)

local debounce2 = false
--//Touched
tool.Handle.Touched:Connect(function(hit)
    if debounce and hit and hit.Parent:FindFirstChild('Humanoid') and not debounce2 then
        debounce2 = true
        hit.Parent.Humanoid:TakeDamage(10)
        wait(0.5)
        debounce2 = false
    end
end)

Here's a gif that shows the problem. https://gyazo.com/c2df592e8e8bee75ab45651dc8772d60