Nali Weapons 3 is a new weapon pack for Unreal Tournament, containing 17 new weapons, new pickups, ultra gore, nukes and more.
This is the effect of a new mutator called: Exploding Headshots.
For each and every headshot, the head will actually explode in several bits that fill the walls with blood and head parts, besides leaving a blood fog behind for a while.
Gross! But cool :D
I love it!