Let's Talk About the Story!

Sorry to disappoint but I can't answer your question. But I would like to add on to it. I feel like the elephant stands for something, in a philosophical way. The best I could do was think that it somehow stands for his disturbed conscience in the way that it ate up the girl. Maybe. I would also like someone to explain the appearance of the angel, especially in the climax.Thank you.

This reply contains spoilers.
The film, as you probably know, is based on a short story by Unni R., which appeared in Mathrubhumi weekly by the same name. The story is a very grim and dark metaphor for man's constant pursuit to satisfy his urges. It also depicts the face of our society which openly acts as they are morally superior, but underneath, we all are morally bankrupt.
The final scene depicts the elephant taking the life of the girl which represents nature taking its turn. The elephant can be thought of as the unpredictability of nature or the mighty powerful force which thwarts human's attempt to go against the nature of things. The ending also tells with brutal honesty that it will always be the poor and powerless who will pay the price of society's attempts to take control of nature. The scene which shows Leela's father crying after he sends her with Kuttiyappan depicts his guilt and that man will go to any extend to make money out of desperation to survive and in that process will forget even the most fundamental moral and ethical considerations.