Those two Russian kids are Brother Justin and his sister. He doesn't remember much of his early years, and those memories are starting to creep back in.
The blind seer smacked the bearded lady for no real reason, other than to start emphasizing that he's "bad."
At first, I thought the kids by the river were two of the dead orphans that died in the church fire. The girl asked "why are you chasing us?" and then "where are the others?" I thought more on it, and remembered that on that bridge, Justin muttered "I killed him", so I wondered if he wasn't the Russian boy. I also remembered his sister calling him "Alexi" when he called her on the phone.
I figured that might be the case, regarding Lodz hitting the girl. I just watched the next episode, and things are starting to make more sense. (Lodz is caught by Samson having a conversation with 'management').