"I'm not exactly sure how many ghosts there are so round about sixteen of these. If I can make a wide enough field I might get lucky and trap two at once if they travel in pairs."
The Doctor shrugged as he smiled and took back the cone to place it down on the ground. He walked over to the center control area again as he looked up towards the ceiling in thought.
"I know that one person will need to be in here to flip the switch and at least one person where the cones are perhaps even two. My only problem will be how to set them up without causing much danger to the other residents."