Calling for the helicopter wasn't to land in the courtyard, but because it had a more powerful infrared imaging device.
The infrared devices the police held were just for police use, but the one on the helicopter was military-grade.
In other words, if there really was someone in the yard using some device to shield from infrared detection, they might fool the police but not the helicopter.
The helicopter scanned twice, indicated there was no one, and said we're still going to search the wild, stop bothering us every moment.
While they did this, Feng Jun and Sofia stood in the air nearby, watching coldly.
Have to say, Sofia was really daring; they were at least fifty meters from the ground now. She wasn't scared, but appeared exceptionally excited, leaned towards his ear and whispered, "The helicopter can't see us?"
