In plain words
Along with Rāma, Lakṣmaṇa too went and sat down beside Viśvāmitra. Then Viśvāmitra: “Rāma and Lakṣmaṇa! This is a yajña held in the forest. Where I live is the Siddhāśrama. There is no way to cook or prepare food there. You are princes; you are used to tasty food and a comfortable life; and now you are coming with me to guard the yajña. Who knows how many days you will have to stay there! Sleep must not come to you. You must not suffer for want of food. So I shall impart to you the mantras called ‘Bala’ and ‘Atibala’. By their power sleep will not come to you, and you will feel no hunger or thirst,” he said. He imparted those mantras to Rāma and Lakṣmaṇa. Why should Viśvāmitra, who had described Him before Daśaratha with “Rāma is no ordinary person; He is the protector of the world”, give Rāma a mantra here? This is the very power of Māyā.
The yajña began. Mārīca came and tried to disrupt it. With one single arrow Rāma sent that demon falling somewhere far away. Then came a great noise, loud enough to split the ears. Rāma, to Viśvāmitra: “Swami! What is this sound? It is as if mountains are crashing down!” He said. To this Viśvāmitra: “It is not mountains crashing down, my son! It is the voice of Tāṭakī. She is coming; be ready,” he warned. A doubt came to Rāma. “Swami! Killing a woman is not the dharma of a kṣatriya, is it!” He said. To this Viśvāmitra: “Rāma! Where guarding the yajña is concerned, you need not keep any distinction between woman and man,” he said. Not wishing to go against His guru's command, Rāma killed Tāṭakī. But Tāṭakī did not die so easily. A great battle took place. We do not need those details now. With Tāṭakī's death, an atmosphere of peace settled over the Siddhāśrama. The gods showered flowers. The yajña went on without hindrance.
Meanwhile a messenger came from Mithilā and handed Viśvāmitra a letter.