Jack is fighting against some very deep wounds, both physical and most of all, psychological. Killing your first human will do that. Tartakovsky is a very smart guy and understands this kind of processes and allows that time to Jack in a mostly wordless and painfully real recovery time, at least, he was not alone since the wolf from the previous episode returned and kept him company. Kindred spirits right there.
Very important to all of this is a flashback in which a young Jack sees his father kill some bandits and that memory serves finely to point the subject of this episode: we are the result of our decisions and sometimes there's no other way but to move forward, specially against an evil you cannot reason with, which sadly is the case of the daughters of Aku. They are just the latest victims of the evil that represents Aku and one of the saddest indictments is when they see two deer for the first time ever and think they are Aku's machines, rooting for them to attack each other. It's just sad, specially after seeing at least three of them meet their fate.
And speaking of faith, the fight of Jack against the daughters is both the most brutal the show has gotten and one of the most stunningly beautiful sequences of the whole show, seeing the two parties fighting in the snow, with Jack expertly ambushing his pursuers while hiding in the snow, very reminiscent of both Kill Bill and most of all, the fight of Jack versus Shinobi. It's just a sight to behold.