The man who shot Anuj Bidve in Salford has said he and his friends "should have taken a taxi", a court heard today.
Anuj was shot in the head as he walked into Manchester on Boxing Day.
Kiaran Stapleton is on trial accused of his murder. He has admitted manslaughter on the grounds of diminished responsibility, but denies murder.
Manchester Crown Court has been hearing from a forensic clinical psychologist, Dr Adrian West, who has interviewed Stapleton.
Dr West told the court he asked him why he selected Mr Bidve, who had come to the North West to study at Lancaster University.
"He replied, 'only because he had the biggest head'," he said.
He said Stapleton went on: "I blew a hole in his head. There is nothing I can say, nothing whatsoever.
"They should have got a taxi. Things would have been different if they had got a taxi."
When asked about his own situation, Stapleton said: "My life has just turned upside down within the click of a finger."
Simon Driver, junior prosecuting counsel, asked Dr West what his opinion was on Stapleton's state of mind as he crossed the road to approach Mr Bidve.
"I consider he moved purposefully and then he purposefully asked the time because that gave him an opportunity to have a better select of those people in front of him," Dr West said.
He added that Stapleton's positioning and the way he fired the handgun was "purposeful" in its accuracy.
It has been agreed by all the clinical experts that Stapleton suffers from an anti-social personality disorder.
But Dr West said he did not think the defendant had a total lack of empathy.
"He has impaired empathy," he said. "He is still capable of being aware of the feelings and states of other people and the effect of his actions on them."
The psychologist said Stapleton would have been aware that his comment that he shot Mr Bidve because "he had the biggest head" would shock him.
He did not see Stapleton as "characteristically impulsive".
He had no history of problems with alcohol, drugs, gambling, self-harm or sexual recklessness.
The trial continues tomorrow.