Outside Hollywood, November and December are a time of good cheer, but in Tinseltown, 'tis the season of fight or flight. As studios prepare to unveil their big holiday films, it's time to eye the competition and decide whether to dig in their heels and brawl, or move to a lower-profile release date. Take Robin Williams' Jumanji: The F/X-packed kid fantasy was to have opened Nov. 17 between Jim Carrey's Ace Ventura sequel and Disney's Toy Story, until TriStar bumped it to Dec. 15. For big kids, Miramax's Four Rooms switches from Oct. 6 to Nov. 22. The studio says it moved the Tarantino & Co. flick to bring in homecoming college students. Then again, it may also have to do with the bad buzz the film generated at the Toronto International Film Festival earlier this month.