==>

LEO: “That doesn’t look good.”

JACQUELINE: “How strong is that wall?”

LEO: “I don’t know. The ghosts told me that the closed rooms had a core of some ‘dark substance’ in, which prevented them getting through. When the doors open, it disappears.”

CLARA: “That must be so the only way out is through the puzzles.”

JACQUELINE: “That’s cool and all, and probably bears more thinking about, but that sort of pales in comparison to the fact that someone is breaking the wall down.”

LEO: “Can’t you extend the field? Stop him doing any more damage?”

JACQUELINE: “Not for very long. What we need to do is work out what to do when our friend here busts through the wall.”