"Avengers: Endgame" screenwriters Christopher Markus and Stephen McFeely attended San Diego Comic-Con on Friday, July 19 for a panel and said that Robert Downey Jr. gave some notes on how much dialogue Tony Stark/Iron Man should have during his final scene.

McFeely said that he and Markus wrote "all sorts of lovely dying words for Tony Stark," but the actor felt that the moment would be more impactful if Tony didn't speak.

"He knew that, and we didn't feel we could turn in a page where he didn't talk," McFeely said. "So he says, 'Listen, I want to do much, much less,' and he was right."

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"Avengers: Endgame" star Robert Downey Jr. insisted that Tony Stark shouldn't speak much during his final scene in the blockbuster movie.

Screenwriters Christopher Markus and Stephen McFeely were in attendance at San Diego Comic-Con on Friday, July 19 for a panel and spoke about the "collaborative" effort that went into making the Marvel movie. Specifically with the heartbreaking death of Tony Stark/Iron Man near the conclusion of "Endgame," Markus and McFeely said that Downey Jr. (who has portrayed the superhero since his first standalone movie in 2008) gave some input into how much dialogue his character should have.

"These actors have spent a lot of time with these characters," McFeely said. "So Chris and I are very happy, and did, to write all sorts of lovely dying words for Tony Stark. Robert is not happy to say them, right?"

McFeely went on to say that Downey Jr. knew "instinctively" that "a guy who has talked and talked and talked for many, many movies, when he doesn't talk, you are crushed."

"He knew that, and we didn't feel we could turn in a page where he didn't talk," he added. "So he says, 'Listen, I want to do much, much less,' and he was right."

Read more: Robert Downey Jr. shared behind-the-scenes photos from a devastating 'Avengers: Endgame' moment, and it'll hit you right in the feels

Robert Downey Jr. and Tom Holland in "Avengers: Endgame." Disney/Marvel

In "Endgame," Hulk wielded a gauntlet and snapped his fingers to bring back the characters that disappeared in "Avengers: Infinity War." The major battle in "Endgame" featured all the Avengers fighting alongside each other to take down Thanos.

As the team was losing against the Titan, Doctor Strange reminded Tony that there was only one outcome in which the superheroes were victorious. Tony then got a hold of the stones with his own gauntlet, said, "I am Iron Man," and snapped his fingers to make Thanos and his army disappear.

The line was a direct callback to the first "Iron Man" movie, and Downey Jr. actually had to be convinced to do a reshoot for "Endgame" and say his character's iconic line.

The power of the stones was too much for Tony, and he died as a result. In his final moments lying on the floor, he was comforted by Rhodey/War Machine, Peter Parker/Spider-Man, and Pepper Potts.

Pepper then held him and said, "Tony, look at me. We're gonna be OK." She went on to cry and kiss his cheek while the other Avengers solemnly looked on.

A recently released video that's included in the upcoming digital and DVD release of "Endgame" also showed the superheroes kneeling following Tony's death. The scene was ultimately cut from the three-hour movie.