After Rama killed Kumbhakarna, Indrajit conducted a ritual to imbue his weapons with even greater power and then returned to the battlefield, invisible.
As Indrajit began to rain down deadly arrows on the monkeys and bears, they screamed in terror, defenseless against this invisible warrior.
"Indrajit has come for us, brother," Rama said to Lakshmana. "We must expose ourselves to him now, before he kills us all."
So Rama and Lakshmana rushed forward, and Indrajit launched his Brahmastra directly at them. The two princes sank to the ground, and Indrajit flew back to Lanka, roaring with the joy of victory.
Inspired by: Valmiki's Ramayana.
Notes: This is the Yuddha Kanda (Book 6), sarga 73.