User blog comment:Thailog/Ep. 203 "Alienated" discussion/@comment-3201160-20120512162934

I don't think that Kaldur went completely evil. I think one of the three things happened 

1. He's a double agent that still secretly working for the team (somewhat unlikely however because too cliché) 

2. There is some sort of mind control at play. Not complete co ntrol, because he seemed to be aware of what he was doing. More of an emotion control, where he can only feel anger.

3. The Light claims to be able to somehow bring Tula back, with magic, cloning or Ra's al Ghul’s  '''Lazarus Pit. This is the most likely cause. '''