I checked back and it's specifically ch3, pg 22 where Rihachi hurting himself happens. It doesn't actually show what happened after that, unless it was in one of the chapters between then and now (I'm not re-reading the whole thing to check).
Yeah, he's probably dead. Now that I think about it, it will be kinda weird if they just let people go for what's supposed to be a secret "samurai" sects.