A man may have been stabbed to death in Isleworth after trading "your mum" gibes with his killer, a court heard.
Sahil Roy died in his mother's arms on April 10 this year after being stabbed in his throat and arm in a bin shed on the Ivybridge estate.
The prosecution says Azeem Issa lashed out in fury that afternoon after the 28-year-old had refused to let him roll a joint of cannabis.
But Issa's lawyer claims his client acted in self-defence after being throttled by Mr Roy, who took offence at an alleged slur on his mother's honour.
Both sides summed up the case to jurors at the Old Bailey on Thursday (September 22) as the three-week murder trial draws to a close.
Neither disputes the fact that Issa, 22, inflicted the fatal wounds, but their versions of the events leading up to that moment differ wildly.
'He relishes the savage life'
Riel Karmy-Jones QC, prosecuting, told the court the defendant became enraged when Mr Roy, who was preparing cannabis for the pair of them to smoke with three friends, refused to let him roll a joint.
She said Issa had tried to grab a cannabis grinder from Mr Roy's pocket before shoving him.
When Mr Roy pushed him back, she said, the defendant pulled a flick knife from his waistband and stabbed him twice in quick succession.
Miss Karmy-Jones said Issa, who also went by the name Ricardo Hoods Montana, had been desperate to get hold of Mr Roy that day and had tried to contact him 21 times by phone.
She said Mr Roy's friends described the defendant, who had a part-time job at River Island, as a "leech" who was only interested in the deceased for his money and drugs.
She suggested he may have been riled that Mr Roy ignored his calls that day before contacting another friend Shiraz Ramzan who was in nearby Redlees Park with Issa at the time.
"There can be no doubt the defendant was the one with the knife, who attacked Sahil and stabbed him not once but twice," she told the jury.
"He's a man with violent tendencies who relishes the savage life and lashes out in sudden violence when angry."
'Cold and callous'
She said that, after fleeing the scene, Issa changed his clothes and used a pair of latex gloves to hide the weapon under a nearby footbridge, before heading off the estate to smoke cannabis and drink alcohol.
"He ran off afterwards, changed his outward appearance and then coldly and callously took the knife to a nearby hiding place from where he planned to retrieve it later.
"He went off to drink and take drugs, never thinking of Sahil whom he had left drowning in his own blood."
Pavlos Panayi QC, defending Issa, said the defendant had been trading insults with Mr Roy as they prepared to smoke cannabis that afternoon.
He told the court Mr Roy had said of the drug "that's what your mum's p***y smells like", to which Mr Issa had retorted "your mum's like a petrol pump - she takes it from anyone".
'Defendant was being strangled so hard his legs went numb'
The deceased was so incensed, he said, that he grabbed the defendant around the neck and squeezed so hard that Issa felt his legs go numb.
At this point, he told jurors, Issa had grabbed a knife from Mr Roy's waistband and used it in self-defence.
"It's a dark corridor, the exits are blocked by Sahil's friends, his hands are round your throat and you spot a knife," he told jurors.
"You have to stand in his shoes and ask yourselves how you would react when you decide what happened in those three minutes."
Mr Panayi told the court the three eyewitnesses - Shiraz Ramzan, Mahmoud Moudallal and Prabjhot Lally - had taken more than an hour to speak to police that day.
He claimed they had colluded to "embellish" their evidence and strengthen the case against Issa.
Was Sahil Roy a 'social' drug dealer or 'slightly more serious'?
Ms Karmy-Jones said Mr Roy, who lived on the Ivybridge estate and was an avid Manchester United fan, had been a "social" dealer, who would share cannabis with his friends but only took money from them to put towards future purchases.
She told how his friends had described him as "calm, quiet and never aggressive", and said no one recalled him ever carrying a knife.
She accused the defence counsel of painting the Ivybridge estate as akin to "war-torn Beirut", when in reality she said it was a "rather innocuous housing estate".
However, Mr Panayi suggested Mr Roy may have been a "slightly more serious" dealer who felt he needed to carry a knife to protect himself on what could be considered a "bad estate".
He also pointed out that while Mr Roy could no doubt be "sweet, gentle and good-natured", his history suggested he also had a "temper".
In 2006, he told jurors, his mother Nasira Mananadha had called the police after he threated to burn her and his eight-year-old brother with an iron.
And in 2010, he said, Mr Roy had thrown a cup of cola over Fareha Sheriff, to whom he was engaged at the time of his death.
Row over FIFA Xbox game ended 'amicably'
The court was previously told how Mr Roy and his friends had joined Issa in his flat two days before the stabbing to play a Fifa computer game on the Xbox.
Jurors heard how the others had teased Issa because he was losing, but little mention was made of that get-together by either the defence or prosecution in their summing up.
Miss Karmy-Jones said while witnesses suggested there had been some tensions that day the group had parted "amicably".
Issa, of Haweswater House, Isleworth, denies murder.
The trial continues, with the judge due to sum up on Friday (September 23) and jurors expected to be sent out to consider their verdict the following Monday (September 26).