Will we die?

This line is obviously intended to fuel speculation among fans. Many explanations have been put forward, including the idea that Grindelwald is referring to Horcruxes, that if he dies, it will only be dying "a little" because he has his soul protected. John Granger has suggested that the reference might be a shared connection to Dumbledore -- perhaps something said to both of them. Granger postulates that Newt is an agent for Dumbledore who is actually in New York to track Grindelwald under the pretense of releasing the Thunderbird back into the wild.