Wide open fields were wonderful for genjutsu training because, in the event she fainted in the middle of training, she wouldn't earn herself any complicated neck fractures by accidentally catching herself in a lump of bushes or something--

No, really. They were great for genjutsu training because there wasn't anyone around for miles. Plus, the wide open spaces helped one concentrate much easier. It was great for starting out on a technique. Something about feeling a lot less claustrophobic.

But then, Shisui realizes that Sakura was determined to turn that nice bit of flat grassland into a jagged pile of upturned earth.

"Ah... The grass had just turned green since the winter, too--"

Sakura why?

Be kind to nature--