Question: What cause Warner Bros. to change act 3 of the film "Terminator Slavation"?
About the article "Terminator Salvation", section "Writing".

Candidate passages:
Warner Bros. Entertainment Inc., formerly known as Warner Bros. Studios, commonly referred to as Warner Bros. (spelled Warner Brothers during the company's early years), or simply WB—is an American producer of film, television, and music entertainment.
One of the major film studios, it is a subsidiary of Time Warner, with its headquarters in Burbank, California and New York.
Warner Bros. has several subsidiary companies, including Warner Bros. Studios, Warner Bros. Pictures, Warner Bros. Interactive Entertainment, Warner Bros. Television, Warner Bros.
Animation, Warner Home Video, New Line Cinema, TheWB.com, and DC Entertainment.
Warner owns half of The CW Television Network.
Warner Bros. is a member of the Motion Picture Association of America (MPAA). 
In 1999, two years after C2 Pictures purchased the rights to the franchise, two "Terminator" films' premises were mapped out and were supposed to be developed simultaneously.
Tedi Sarafian was hired to write "", which he eventually received shared story credit for, while David C. Wilson was to write "Terminator 4".
Before any revisions were done, "T3" initially took place in 2001 and revolved around the first attacks between Skynet and humans.
"T4" would follow immediately afterward and centered primarily on the war seen in the first two films.
Warner Bros. gave the film the codename "Project Angel".
Following the release of "Terminator 3" in 2003, producers Andrew G. Vajna and Mario Kassar contracted Nick Stahl and Claire Danes to return as John Connor and Kate Brewster in another film.
Director Jonathan Mostow helped develop the script, written by John Brancato and Michael Ferris, and was set to begin production in 2005 after completing another film.
It was known by then Arnold Schwarzenegger's role would be limited, as he had assumed office as Governor of California.
The producers sought to have Warner Bros. finance the picture as they did for "Terminator 3".
In 2005, Stahl said John and Kate would be recast as the story jumped forward in time.
By 2006, Metro-Goldwyn-Mayer, distributor of the original film, was set to distribute the fourth film as part of the new CEO Harry Sloan's scheme to make the studio a viable Hollywood player.
On May 9, 2007, it was announced that production rights to the "Terminator" series had passed from the feuding Vajna and Kassar to the Halcyon Company.
The producers hoped to start a new trilogy based on the franchise.
The purchase was financed with a loan by Pacificor, a hedge fund from Santa Monica.
By July 19, the project was in legal limbo due to a lawsuit between MGM and Halcyon subsidiary T Asset.
MGM had an exclusive window of 30 days to negotiate for distribution of the Terminator films.
When negotiating for "Terminator 4", Halcyon rejected their initial proposal, and MGM suspended negotiations.
After the 30 days were over, MGM claimed that the period during which negotiations were suspended did not count and their exclusive period was still open.
Halcyon asked a court for an injunction allowing them to approach other distributors.
Later, the lawsuit was settled and MGM got a 30-day right of first refusal to finance and distribute the fifth "Terminator" film.
Finally, Warner Bros. paid $60 million to acquire the United States distribution rights of "Terminator Salvation"; Sony Pictures also paid just over $100 million to acquire this film's distribution rights in most international territories. 
The company was co-founded by Victor Kubicek and Derek Anderson.
In May 2007, Halcyon acquired all of the rights in relationship to the "Terminator" franchise.
These rights include the right to produce any future "Terminator" films, as well as all future merchandising and licensing rights, certain future revenues derived from ', as well as certain rights in the television project ' and the sole right to produce all future" Terminator" projects in any new or existing media.
Warner Bros. acquired the North American distribution rights, allowing them to distribute the 4th "Terminator" film, "Terminator Salvation".
The film began production in early 2008, and was released on May 19, 2009.
In November 2007, the company reported that it was creating its own video games subsidiary, Halcyon Games and will be making a video game adaptation of "Terminator Salvation". 
Warner LeRoy (March 3, 1935 – February 22, 2001), was a New York businessman.
LeRoy was the son of film producer-director Mervyn LeRoy and Mervyn's second wife, Doris Warner, and was the grandson of Harry Warner, one of the founders of Warner Bros. and a major contributor to the development of the film industry. 
According to Warner Bros records the film made a profit of $83,462.