During his exit from the city hall tower, Amon destroyed the top floor and sent a command to his battle puppets. These battle puppets had mind links, allowing him to transmit an order to other puppets via one nearby. His command was to disengage from battle and enter search mode.
Thanks to the Khode soldiers' retreating, the First Demon Army could handle the battle without support from the battle puppets. The battle puppets went around the city and entered various buildings to search. The thing he commanded the battle puppets to search was the helmet-backpack contraption the human puppets wore, or as Zhong Yuan called them, the receiver module for the Mental Regulator.