Warning! Full Avengers: Endgame SPOILERS below!
Avengers: Endgame editors Jeffrey Ford and Matthew Schmidt revealed that there is another version of Black Widow’s death scene on Vormir that did not make the final cut of the film.
In a recent interview with Business Insider, Ford and Schmidt explained how the scene was originally shot. “On script and what we first shot was an excellent scene,” Schmidt told BI. “Thanos and his soldiers show up on Vormir and a small battle ensues between them and Natasha and Clint. Natasha decides to run off the cliff. Clint tries to stop her while also fending off the attack.”
Source: IGN.com Endgame: Widow's Big Scene Originally Included Thanos