GTFO Back Multiplier Mechanic: NPCs that do not take extra damage from behind and how the Back Multiplier is calculated

In the game GTFO, players can deal additional damage to most enemies by targeting them from behind. This extra damage is determined by the Back Multiplier, which varies based on the angle between the player's camera position and the direction the enemy is facing. However, certain enemies, such as Mothers, Big Mothers, Tanks, the Immortal, and the Kraken, do not take extra damage from behind. Understanding the Back Multiplier and which enemies are affected is important for maximizing damage output and strategizing during gameplay.