giant mutant fish, Del Lago, Resident Evil 4, aquatic horror, monstrous creature, sharp teeth, slimy scales, murky water, swamp environment, eerie atmosphere, Leon S. Kennedy in combat stance, harpoon action, dynamic splash, intense struggle, survival theme, over-the-shoulder view, dramatic lighting, foggy weather, video game boss battle, high tension, detailed textures, realistic water effects, cinematic angle, action-packed scene, adrenaline-pumping moment.