evam vainya-sutah proktas
evam-thus; vainya-sutah-the son of King Prthu; proktah-being ordered; tvaramanam-Indra, who was moving hastily; vihayasa-in the sky; anvadravat-began to chase; abhikruddhah-being very angry; ravanam-Ravana; grdhra-rat-the king of vultures; iva-like.