--- Kat ---
Kat was meditating when she felt Hunter approach. Which was the entire point of the exercise. Kat was hoping to get more used to sensing the lamia in case it became necessary when they were fighting the drake. It would be awful if she attacked into an area that seemed empty but actually contained Hunter. Now, if anything Kat did would hurt was another matter, one that she was unsure of.
For example, if Kat threw out a punch, would it hit nothing because Hunter 'wasn't there' according to the world, or would her fist collide with a lamia that was suddenly 'there' instead? What about demonic fire? Would the fact Kat didn't want to hurt Hunter stop it from being an issue, or would she still get hurt? What about breaking the technique that way? It wouldn't be intentional but Kat could certainly see it happen.
