A few minutes later, everyone, including Dave, was sitting in front of Daneel while waiting for him to shed light on exactly how he had managed to identify the threat to their lives in order to save them at the perfect moment.
After he had given that statement, the Head had only smiled in response and then flicked his fingers to make Jessica faint.
After that, he had walked to a particular location in the corridor and stamped his foot down, resulting in a formation that had been laid down around the building breaking into pieces.
It had been concealed in the most ingenious of ways, and it was only after it had been exposed that they were able to see that it was one which blocked them perfectly from any and all surveillance, while also putting out a fake image that would have fooled most surveillance methods.