i cant seem to find out why the if is false, can someone help me here?

have a look I don't know where the problem is here

sp = script.Parent
debounce=true
function burn(hit)
    if hit and hit.Parent and hit.Parent.Name ~= "Part" and hit.Name ~= "Handle" and hit.Name ~= "fire" and debounce then
        debounce=false
        Humanoid=hit.Parent:FindFirstChild("Humanoid")
        if Humanoid then    
            Humanoid:TakeDamage(20)
            fire = sp:FindFirstChild("fire")
            if fire then
                fire.Enabled=false
            end
            sp.Anchored=true
            wait(2)
            sp:Destory()
        end
    end
end

sp.Touched:connect(burn)

this is the script from the "hoe to code your dragon" thing.