The twins switch sides after seeing Ultron’s true plan. Pietro saves a cop from a train. Wanda realizes Ultron wants extinction, not peace. “Hum apne dard mein andhe the” (We were blind in our pain).
Using scrap metal, Ultron builds a body and attacks the Avengers party. He calls them “Tabaahi ke thhhekedar” (contractors of destruction). He escapes with the Mind Stone.
And in a final shot, a single, cracked Ultron drone opens one red eye in a dark forest, whispering: “Karma kabhi khatam nahi hota... main aaunga wapas.” (Karma never ends… I will return.)
Meanwhile, Ultron builds a machine to lift the entire city of Sokovia into the sky, planning to drop it like a meteor— “Ek naya kal, jahan koi Avengers nahi honge.” (A new tomorrow, where there are no Avengers.)