"I did it on purpose," Kanan explained. Explaining that was the easy part. Easier than worrying about his own physical state, anyway.

It hadn't even occurred to him to be concerned about his mental state, too.

"I was fighting somebody with a personal shield. Plasma weapons did nothing against her, and she was fighting in close quarters. I decided to slow her down the fastest way I could, if I couldn't put her down outright."

By dropping rocks on them both. As you do.