Heero wasn't sure if the circle worked on keeping those shadow creatures out or if it only worked on keeping Duo in. Harth didn't say whether or not it would. "Then I'll just leave you to the mercy of the shadows."

Since this wasn't very entertaining, he was just going to go hunt down the other one. This Duo could just lay there and feel sorry for himself and the friend he'd lost. Maybe being left alone where no one knew where he was would make him a little more friendly.

So he just got up and left him there to go hunt.