Skyler was on an airship, observing the place and waiting for his superior's order so he could transform and attack. From above, he could see your titan, attacking the fort.

"Most of the cannons have already been destroyed. It's your time." The superior said, pressing the button on the airship and opening the door.

"It's already show time." Skyler said, jumping out of the airship and cutting his hand with a dagger, transforming into the air.