We follow the same approach as in the quest . It's best to bring a shotgun loaded with high-damage slugs, wear gas protection, find a group of zombies, throw the grenade, and shoot them down as quickly as possible before the gas kills them. spawns on both infected locations and is slightly nerfed compared to his "regular" version, so taking him down shouldn't be too difficult.
Turn in the quest to receive plenty of valuable loot and the unique "Triumph of Science" achievement.
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Therapist