Shout to the Top!

Using Oratorio 8, Colonel Dewey fired on the Scub Coral Control Cluster and destroyed it. Now that it's gone, what is Dewey's next move? Meanwhile, Renton and Eureka are in the damaged Nirvash when the Compac Drive turns blue. Nirvash suddenly moves disobeying Renton and Eureka's orders. What is Nirvash trying to accomplish by doing this?