Ramayan Episode 70
Ravan is shocked to learn that Lakshman is saved. Indrajit goes to perform a tantrik yajna in the temple of Nikumbhila. Bibhishan tells Shri Ram that Indrajit will be invincible, if he can complete the yajna. He, therefore, goes with Lakshman and an army to disrupt the yajna. Indrajit comes out as the yajna is disrupted. He fights with Lakshman. The battle goes on. Indrajit hurls Narayan chakra, but Lakshman humbly does obeisance to the astra and it goes back after doing parikrama of Lakshman. Indrajit realises that Lakshman is not an ordinary human being and he becomes invisible.