The slight delay with which he responds to the command can be credited to the overall disorientation of the moment: how did they get here, where even is 'here', but Benedict does shakily stand and looks her in the eyes.

"I don't want you here," he says weakly, and the dream shimmers around them. This isn't how it's supposed to be going; too much darkness, too much conflict. The illusion is trickling away, but only for Sennara.