The jury is set to retire to consider its verdict in the Bailey Gwynne murder trial.
A teenager, who can’t be named for legal reasons, denies murdering 16-year-old Bailey on October 28.
The jury heard closing speeches from both the crown and defence.
Advocate Depute, Alex Prentice QC, invited the jury to find accused guilty of all the charges – including murder.
He asked the jury to have regard to all of the evidence.
In his speech he said: “You would have to have hearts of stone not to be moved by the emotion in this trial, but you must put emotion aside. You are judges of the facts.
“Why carry a knife and knuckleduster, which has no other purpose in my submission but to cause injury?”
Defence counsel Ian Duguid QC said the accused had displayed “extraordinary stupidity in having a knife with him.”
But he said that Bailey had displayed “recklessness” in assaulting his client.
He described the incident that led to Bailey’s death as a “chance encounter” .
Mr Duguid also referred to Bailey as the “aggressor”.
He went on to tell the jury that if there was no wicked recklessness then they could not convict him of murder and it should be culpable homicide instead.
After the speeches the judge, Lady Stacey charged the jury giving them directions in law.