Sara remained on guard. 

She believed that Kang Oh could, at any time, return her to the confines of the sword. Kang Oh felt like this behavior was undeserved on his part.

"Weren't you the one who decided to be sealed?"

That's right. After he defeated her, Sara had allowed herself to be sealed in order to keep the Ice Soul's power from going out of control. 

Kang Oh hadn't forced her into it!

"T-That's..."

"I picked you when I was presented with the choice between you and the Ice Soul. That way, you were able to see the world, albeit indirectly. Am I wrong?"

The Trial of the Demon Sword had forced him to pick either Sara or the Ice Soul. Kang Oh had picked Sara, which allowed her to maintain her ego.

"And yet, you act as though I've imprisoned you," Kang Oh said logically, causing Sara to bite her lip.

Everything he said was the truth. 

She furrowed her brow, thought things over, and said, "Thanks."

"Good. We can get to talking now."

"Talk about what?"

"For starters, don't run away from me. And don't attack me either. If you don't escape my control, then I can give you some measure of freedom."

"Freedom..."

"You can see the world with your own eyes, touch things yourself,...