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Sydney's samurai sword killer and his fiancee have revealed why they went on the run with more than $20,000 in cash and five nunchucks following the gruesome crime.

Ice-fuelled armed robber Jet McKee stormed Blake Davis' Forest Lodge home in August 2018 and hit the 31-year-old in the eye with knuckle dusters - temporarily knocking him out.

Davis' fiancee Hannah Quinn then chased after the balaclava-clad McKee who had taken her handbag.

Davis regained consciousness and ran outside before striking McKee with his samurai sword, slicing his head and killing him.

Shortly after David struck McKee, the couple ran back to their house and threw five nunchucks, a toy pellet gun and $21,000 in savings into a Menulog paper bag. They went on the run for three days before turning themselves in to police.

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Davis was acquitted of murder but found guilty of the hip-hop artist's manslaughter and was jailed for at least two years and three months. 

Quinn, 26, last week avoided jail time but was sentenced to a two-year community corrections order after she was found guilty of being an accessory after the fact. 

The couple broke their silence in an explosive 60 Minutes interview on Sunday night, filmed prior to their sentencings.

Davis, who has no memory of parts of the incident, admitted he is still perplexed as to why he packed a bag of bizarre items before fleeing the scene.

'It just shows how much my head wasn't in a good place to have five nunchucks in a bag and to be leaving with this,' Davis told Tara Brown.

'It just showed how irrational [we were] and how we were not okay at that point. We were just going off fear and impulse.

'I don't know even why those things were taken.'  

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Quinn said she was terrified McKee, who at the time she believed was still alive, would come after them.

'It's like this shockwave comes through me and I'm like, "we've got to keep moving and get away from this guy who's coming after us",' she said.

With their one bag packed, the couple fled their house and hid in a laneway while a passerby called police after finding McKee bleeding out.

However, Quinn dropped the bag of money and left it discarded in the back street they had been hiding in.

When asked by Brown why she abandoned the cash, Quinn couldn't give an answer.

'I'm not really sure.. I mean, it seems crazy,' she said.

Davis and Quinn spent the next three days moving from hotel to hotel in the city and at Pennant Hills, fearing McKee or his accomplices were coming after them.

'We didn't want to go and stay with family and friends out of fear that if someone found us we would be putting our loved ones in danger,' Quinn said. 

Davis said they soon became paranoid that McKee's associates were nearing in.

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'You start to question everything and start to look over your shoulder at every single person and see that there's a potential danger or threat anywhere,' he said.

'I don't think [calling the police] was even a thought at that first initial time just because we were running off fear.' 

It wasn't until days later they heard on the news via a taxi's radio that McKee had died just moments after their encounter. 

Quinn's defence lawyer Lauren MacDougall believes the use of a samurai sword, avoiding the police and Quinn following McKee out of the house led to the jury convicting the couple of manslaughter.

'I think the jury were troubled by various aspects of the case,' she said.

'I think the use of the sword troubled them. I always think if he didn't get a sword, what if he got something else, would that have been a different outcome? It's an exotic object that he happened to have lying around.'

Ms MacDougall also speculated the jury 'might not have understood or accepted' why Quinn went after McKee after he fled the house.

'She left the house and followed him to get her bag back,' she said.

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'Probably also the fact that they didn't go to the police sooner I think that didn't sit well with the jury perhaps.'

Ms MacDougall also said the jury wasn't satisfied that Davis was acting in defence of his fiancee, who he thought was just seconds from being shot.

'Essentially the main thing to understand with self defence is the reaction of someone has to be proportionate with the threat or the perceived threat,' she said.

Davis in the trial gave evidence about his belief the intruder had shot him when he was hit with the knuckle dusters, and claimed he thought his fiancee's life was in danger. 

But the Crown contended that no witnesses saw McKee pointing a gun at Quinn before he was struck with the sword, as professed by Quinn.

Little did the couple know, the gun found next to McKee's body only contained blank cartridges.  

Justice Natalie Adams accepted Quinn stuck with the 'love of her life' out of misguided loyalty and because of her emotional attachment.

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'Nothing she did that weekend showed any plan to indefinitely go on the run,' Justice Adams said.

During Davis' sentencing in March, Justice Adams accepted Davis would have been in severe pain after being punched in the face with knuckledusters by McKee and was suffering from a concussion and vision impairment.

'He was suffering fear and trauma given that he had just had his home invaded by a masked man wielding a gun and was terrified as to what had happened to his girlfriend,' she told the court. 

'It would clearly have been a very traumatic event.'

She said she was though satisfied nothing other than a full-time prison sentence would be sufficient punishment in Davis' case.

She said Davis was not usually a man 'prone to violence' but had to be sentenced on the 'basis that he somehow mis-read the situation' in regards to the threat Mr McKee posed on his girlfriend.

The court also heard Mr McKee had been high on ice at the time of the home invasion.