A question about the murder. [Spoilers]
The opening of the film establishes very clearly that not only was the homicide victim killed by several blows to the head, but that his body was severely mutilated.
What I don't understand is this: How did the character of Colin MacIver go from simply killing a man with an ashtray in a fit of rage and guilt, to cutting off his penis and fingers after the fact? Did I miss something in the dialogue? It seems like quite the leap.
Thanks.