He had chosen that locations because the two of them could go all out and not worry about causing destruction to people and infrastructure. There wasn't any of either within a decently large radius.
"Let's begin then." kyrie adopted a simple balanced stance. "I have a training session to head, soon after this."
Her stance placed an equal weight on power, mobility, and defense. A neutral, all-rounder stance.
Rui simply adopted a similar stance.
The two of them simply maintained a deadlock, staring at each other. The sheer weight of their focus and concentration yielded a pressure that exerted itself on the scant sentient life that was anywhere even remotely close to them in any capacity.
Birds took flight, and pests and other small critters evacuated as they scurried for their lives. Their battlefield grew truly barren of any sentient lifeform.