Was Citronen ill?
I sort of had the impression that he had some sort of terminal illness. There was a scene where he takes a pill, and then other scenes where he appears to be pale and sweaty and in pain when there's no ostensible reason for him to be. Also, I think it's why he gave up on his wife and daughter so easily and why he took such risks - he was going to die anyway.
That's the impression I had. I caught this movie in the middle of the night and stayed awake to watch the end of it, so my impression might have been flawed.