The Adrenaline should riot in peace.
Invulnerability PowerUp is too cheap, and removing it with the Impact Hammer is very troublesome.
While it is too cheap, Invul existed in older games such as doom, etc too...
And there was no way of removing it....and dm in these games can be freaking fun also...but still if invul annoys anyone, it can be removed by some mutators, just like for example at uteamfix mod for Unreal exists possibility of removing invisibility and amplifier in the options......