Right at that moment, President Bai and that Elder Ji Xing next to him hadn't gone very far and were at the top of this apartment building. When they turned around earlier, they teleported to the top floor of the apartment, which they had just bought by giving the previous owner a price he couldn't refuse, in order to monitor Elder Zuo Wu's movements.
The truth was that President Bai had already anticipated that Elder Zuo Wu would fail in this operation. Before Elder Zuo Wu had set out, President Bai had deliberately looked for a diviner, who had given him an ominous reading.