The defence begins summing up in the trial of three boys accused of murdering Mikey Roynon, 16.
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The three boys on trial, who cannot be named for legal reasons, deny murder.
Their defence, while summing up at Bristol Crown Court, said the violence broke out after they were confronted by a group of armed teens at the party.
During the trial all three defendants chose to not give evidence and instead produced written statements.
Defence counsel Raymond Tully KC said that in Boy A's statement, he admitted fatally stabbing Mikey in the neck.
"He admits he killed Mikey, he admits he wielded that knife and stabbed Mikey, but he says he did that in self-defence," Mr Tully told jurors.
"We hope that you will reflect on the fact that Boy A says he faced a situation where there was a large group of Bristol boys armed with large knives.
"Boy A is entitled to be found not guilty if he was acting in self-defence."
During
summing up for the prosecution on Thursday, Christopher Quinlan KC said the fact that Mikey had been stabbed in the back of the neck meant jurors "must consider that the location of the wound would be a very unlikely location for self-defence".
But Mr Tulley said the pathologist who examined Mikey's body suggested his neck could have been moving.
This, the defence barrister said, would make it "hard to prove what movement the body was making at the time".
The jury also heard the defence for Boy B. Mrs Anna Vigars KC said he had felt threatened at the party because "boys from Bristol" were carrying knives.
She asked the jury if they could rule out that he got a knife to defend himself.
