The Heads Up skillshot is achieved by kicking a Nom Parasite on an enemy's head and then decapitating him. This is easiest to do with the Flailgun by using a regular flail to wrap around an object and decapitate the enemy or use the Charge Shot.
Trivia[]
- "Heads Up" is often said as an ironic warning for someone of something that could hurt them, usually on the head itself.