Again, Rodya feels crushed by Razumihkin's attentions and needs to get back to his secret world of which Razumihkin cannot be a part, and thus there is another difficult parting.
The appearance of the mysterious man who calls him a murderer is disturbing and extremely upsetting to Raskolnikov. In reality, he is the man who was present when Raskolnikov returned to the scene of the crime. He is later present when Raskolnikov returns to Porfiry's office, and he is the "hidden" fact that Porfiry keeps referring to.
After being forced to defend his theory to Porfiry and being called a murderer by the mysterious stranger, Raskolnikov is prompted by his own confusion to attempt to re-examine his theory. This re-examination reveals that he still believes strongly in the basis of his theory, but he does see that he was not good enough to execute the theory. He feels little remorse for the actual murder or death of Alyona, but instead resents the old pawnbroker as being so low that her very vileness spoils his theory. His reasoning is that if his theory is noble, it should have been tested on a noble object.
