The plan had been to get to Luke and Leia, and get them to the Falcon as quickly as possible, not engaging Exar Kun until afterwards, if Jacen and Jaina needed his assistance. That had been the plan.
But when the Sith burst through the doors, Anakin sensed the fear mounting between Leia and Luke. He was still ahead of Jacen and Jaina. His children stood between him, and their tormentor.
Mantis, get them on the ship! Anakin shouted through the Force, his lightsaber flying into his grasp and igniting. With a roar, Anakin launched himself in the air, the jump aided by the Force, and landed between Kun and his children.
"Time to play," he said, lips curling in anger as Vader lifted his lightsaber, drawing back his arms into a Shien opening stance.