Leo confirms with himself what Theta said to him without sending out any signals. He thinks that if there is something weird going on with mainframe as it is, and also maids, he doubts shutting down mainframe would be sure solution to the cannon as it may have back up system. So he starts move towards the cannon with the lates information Theta send for him. Starting climb up and try reach get inside to the cannon engine parts and control room, assuming it has manual control area. He then can try figure out how disable the cannon or very least immobilisize it if he quickly shifts and uses his super strenght to rip of it's engine parts.