Sansa and the others were taken aback. They had just seen the range of Roan's Death World and thought that it was the limit. Never did they imagine that Roan wasn't using even half of its full range. Because they wanted to stay close and act once the battle between Sansa and the twins was over, they got caught up by it.
Surprisingly, Sansa instead received a Divine Sense Message from Rean, telling her, 'Stay still. Just protect yourself.' Sansa didn't know why Rean would ask her to do that, but she quickly passed the message to her guildmate, and they prepared for any possible attack.
Knowing they had everyone inside Roan's Death World, Rean and Roan immediately started the next part of their plan.
'Death Style, Fifth Form, Mirage Assault!'