Ibani had almost not expected that to work, but she's relieved when it appears to do just that. She starts to walk, slowly, toward the edge of the city. (Running attracts attention, and she doesn't want attention right now.)

If he lets her break his line of sight, she really WILL vanish. Force cloaks are useful like that. Hiding her path through the sand will slow her down, but she'll manage.

The Force can be both irritating and helpful with the visions it provides. It shows Ben a place he knows, a place where a krayt dragon lairs, shows him Ibani's hands red with blood and holding her sword. The hand position and the amount of blade visible are all wrong for the blade to have been turned on someone ELSE.