C1271 Sneak into the black building

After the Nighthawk helicopter landed on the rooftop of the black building opposite them, it did not take off again. Due to the mysterious energy shield, Xia Lei was still unable to see what was happening inside the black building. But he was in no hurry. While he was waiting for the Nighthawk helicopter to take off, he took the two little cows for a stroll around the building