One moment everyone was doing their own thing, in their places and ships until suddenly they were all in a large room similar to that of a theater, with rows of cushioned seats all of them sat in one, and a large screen on the wall in front of them

No visible doors to leave out of.

Monkey D. Luffy, Trafalgar D. Water Law, Eustass Kid, Roronoa Zoro, Urouge, Killer, X-Drake, Basil Hawkins, Scratchmen Apoo, Jewelry Bonney, and Capone Bege were all in this room. To what though? To react to someone or something.