Stomp Ability Exploit
Once you unlock Stomp at Power level nine, you can kill enemies by stomping on their heads. However, the game does not require the enemy to be laying down on the ground to do so. Because of this, you can stand on a vehicle and continuously stomp on the heads of the enemies. This is especially useful on the far East corner of the map, on the bridge. Combined with the Kill Frenzy perk at level eleven this is a very effective exploit to to gain Power XP, especially at night.