The nice thing about Siffleur is that he isn't shy about explaining his thought process, which leaves any failure to understand as entirely Jack's fault.

"Really?" Jack says. Maybe it's the blood loss from that near-hamstringing and the nip earlier (which is starting to hurt now that he isn't pumping adrenaline for a fight), but he feels like he's missing something. "Are you sure?"

He's missing something, and also there's something - just - unfinished about all this. What's going on?