User blog comment:Atanchan/Lumi, the Poro Knight/@comment-7709681-20140815192136/@comment-7709681-20140815212253

But during Amumu's ult they can still deal damage, only with abilities, but can deal damage; here you can't be damage, disable or debuff nor your allies unless your allies are outside of the area of effect. That's why I told you that at least increase the cooldown at later levels, like 140 / 130 / 120.