Donna frowned thoughtfully as she watched his fingers slip through the wall. Honestly, she wasn't entirely sure what it could mean, with the exception of possible danger to the pair of them.

...Or perhaps whatever was sending out that energy was using the fake wall to hide. "Where's that map you grabbed earlier?" she asked suddenly, wanting to know if there was a specific room the alien was in. "And why is the energy just in this area? Does it feel menacing or anything?"