As Zhao Yu was using the Invisible Detector, he already knew that the killers had advanced communication devices in their ears when he was fighting against them earlier.
However, due to the signal jamming device, their communication devices had also been affected. As such, Zhao Yu was certain that, if the killers had backup on the outside, they wouldn't know what happened in the building yet!
Because Zhao Yu considered that, he didn't take the risk of turning off the signal jamming device. This was because the very moment he turned it off and the backup couldn't contact the killers, they might very likely decide to escape ahead of time. Then, Zhao Yu wouldn't have the chance to save Cui Lizhu!
However, on the other hand, Li Luoyun and Ma Laodan were severely injured. If they didn't receive immediate treatment, they would be in grave danger. Hence, when Zhao Yu exited the building, he ran towards the main entrance.
