For Wolf3D, the player was the only one using full hitscan. Enemies simply decided hit or not based on a dice throw, adjusted with distance to player. Worked

For Wolf3D, the player was the only one using full hitscan. Enemies simply decided hit or not based on a dice throw, adjusted with distance to player. Worked well enough until you start noticing they shoot trough almost-closed doors, eaxh other, etc... Doom did a lot better, hence the monster infighting