After Lou Lan was captured by the police, the Celestial Master who had helped them in the process had tightly ensured that the prison which held Lou Lan could never be broken by any ordinary people and even only Celestial Master's stronger than him, the caster could do so. He is stronger than a half-baked cultivator like Lou Lan so it is more impossible for him to escape with his qi sealed in him.
The Celestial Master had left the police station to report to his sect that he had completed his mission. He didn't leave the area completely but went out of the station to use a communication talisman to report. His report was immediately received by the Mission Tower and his mission was considered complete. The next instruction he received is to wait for someone from the Feng Clan to hand over the criminal called Lou Lan.