What happened to OD? After OD fights Berg Katze he meetings up with Rui and hands him his note back covering up the blood coming down his arm. we also see a shot of his back all cut up. after Rui leaves OD's arm begins to bleed profusely before he collapsed.

Now at the end we don't see OD no one makes mention that he died and Joe bled just as much after being beaten by Berg Katze. ao i am wondering, what happened to OD?
If you watch the OVA episode (director's cut of episode 12, released with the BD/DVD box release), you will know that  


   OD is alive, since he was healed by Utsutsu.