Well, not everyone knows that fact. Dairine included.

If he told her what was going on, then she could assess the situation for herself and decide if she wanted to get involved. As it is, Dairine is taking this dream like most of her assignments -- an unknown task with unknown dangers. She'll work on the details as she goes.

"Uh huh..." Somehow she doubts that. "Then what happened to your face?"