Responses
Probably but not without a serious backlash according to some spoilers I've read...
Maybe the amount of power he exherts sending Koichi back will kill him?
It won't but Caius' will still pay a significant cost
I forgot the chapter but in one of the chapters the doctor is running away and explains that it would difficult. He also says that it would take a lot of magical energy. Now Caius had probably practiced for years just to get kouichi there. Not meaning to send him back. That is years worth of magical energy right there. So my question is
Does he have enough energy to send kouichi back and be okay?