Fastball
From Halopedia, the Halo wiki
Fastball is a medal in Halo 5: Guardians and Halo Infinite multiplayer for killing an enemy with the impact of a thrown grenade.
In other words, this is specifically when the enemy dies from the force of the grenade hitting them, not from the actual explosion.
Gallery[edit]
Unused version of the medal from Halo 5: Guardians.
The Halo 5: Guardians version.
The Halo Infinite Multiplayer Tech Preview version.
The Halo Infinite version.

