Yea this has happened to me twice. After Defeating the Original Green Lantern aka Alan Scott in the JSA headquarters, he gets back up and starts murdering me. He begins attacking me again as I am was picking up Sinestro, after I defeated Scott, then while the Headline movie plays he knocks me out. It's no big deal really I still get all my feats from defeating him and I only face him once but I wanted to bring it up. Has anyone else encountered this? I'm a PS3 user by the way.
Been a while since I did that instance on my villain. Used to farm him for his boots style. I can try again later and see if I get same issue.