To stop Scarecrow from blowing up Ace Chemicals in Batman: Arkham Knight, you need to prevent the chemicals from reaching the mixing chamber. After rescuing the Ace Chemicals workers and stopping the delivery of chemicals into the mixing chamber, Batman will then focus on stopping the bomb from detonating, which involves using the Batmobile to access the platform above the mixing chamber doors and interact with the fuse box to disable the bomb. Here's a general breakdown of the process: Rendezvous with Gordon: The mission begins by meeting Gordon at the Ace Chemicals plant. Infiltrate the Plant: You'll need to open the main gate to allow access for the Batmobile. Rescue Workers and Information: Navigate the facility to rescue the missing Ace Chemicals workers and gather information on Scarecrow's plans. Stop Chemical Flow: The primary goal is to stop the chemicals from being loaded into the mixing chamber to prevent the explosion. Disable the Bomb: After the chemical flow is stopped and the mixing chamber room is cleared, you'll need to use the Batmobile to launch yourself onto a platform overlooking the chamber doors. From there, you'll interact with a fuse box to disable the bomb. Escape the Facility: After these steps, you must find a way to escape the facility before its destruction.