[ Oh, there was a catalyst. ]

She let all of her frustrations build up to a point where she destroyed a large part of the forest and exhausted herself. I gave her an outlet to unleash it in smaller, but safer doses through sword fighting. By teaching her, I could keep an eye on her and make sure she didn't over do it.

[ Velvet was a strict instructor when it came to Usagi, not letting the other work herself to death with her sword training. ]

I can do late nights if that's best for you.