A machete-wielding drug dealer put three people in hospital during a vicious one-man crime wave.
Daniel Lindsay, 17, broke a pizza delivery driver's skull because he claimed he rang his front door bell too late at night.
He went on the run and booked into a hotel, but twice knifed the manager when told to leave for smoking cannabis.
Just days later, he repeatedly stabbed a drug addict - over an £80 debt - who lost five pints of blood and nearly died.
When finally arrested, police caught Lindsay with a Rambo-style machete, sawn-off shotgun and a stash of cocaine.
Liverpool Crown Court heard Islam Al-Haj delivered a pizza to Lindsay's Carstairs Road, Kensington home on September 27 last year.
He only remembered giving the food to Lindsay and walking back to his car, before he was hit on the head, then woke up in hospital.
Mike Stephenson, prosecuting, said he was in fact helped to his feet by Lindsay's dad Robert Kennedy, but declined an ambulance.
Mr Al-Haj, who had bleeding on the brain, actually drove himself to hospital - where he spent three days - but had no recollection of this.
When interviewed by police, Lindsay said he was "annoyed" his victim rang the door bell, when he expected a call to his mobile phone.
The teen said he didn't like Mr Al-Haj's attitude so punched him twice, then when his victim struck back with a dog chain, repeatedly hit him.
Mr Stephenson said: "Following his first assault, the defendant went into hiding, preying on those dependant on him for drugs and using them as fronts to secure hotel accommodation in their identities."
CCTV footage showed heroin and crack cocaine user Stephen Caine booking Lindsay into Hotel Campanile at Queens Dock from October 20 to 23.
Manager Christopher Chater went to their room on October 22 because of a strong smell of cannabis and used a master key to enter.
Mr Stephenson said: "He saw a large pile of cash and numerous rolled reefers on the table. It was obvious to him he was dealing drugs."
He told Lindsay to leave but he broke a light, so Mr Chater tackled him to the ground outside, before trying to put him in a headlock.
Mr Chater said the teen bit his right wrist, then he heard an "unclipping sound" and saw him thrust a machete towards his stomach.
Hotel worker Simon Dodds saw Lindsay with an "Army knife" - a machete with a 12-inch blade - before he stabbed Mr Chater in the back.
The court heard he fled but returned to collect a bag he left behind, yelling: "Give me my f***ing bag
Lindsay later claimed he had a knife on a necklace which he only used because "I was getting choked out", but this was rejected by prosecutors.
He said he ditched the knife nearby and vomited afterwards because he thought he had killed Mr Chater.
Mr Stephenson said that when arrested months later he was wearing a "sheath knife" - the machete shown in court - on his belt.
Mr Chater, who received stitches for a cut to his back, also suffered a one-inch wound to his groin.
On October 31, Lindsay allegedly stabbed drug user Jamie Rawlinson, but prosecutors dropped charges relating to this for "evidential reasons".
Stephen Caine, the drug user who booked Lindsay into the hotel, heard about that stabbing and was scared because he owed Lindsay £80. He said he found him in London Road, Islington at around 10.30pm.
Mr Stephenson said he "flew at him with a knife", adding: "He told him he was going to stab him in the neck and boasted he had just stabbed Rawlo."
Lindsay stabbed Mr Caine in the leg and the victim tried to run away, but he slipped in a pool of his blood and the teen stabbed him again.
He ran off when a car pulled over and the driver gave first aid to Mr Caine, who doctors at hospital feared would die.
Mr Caine, who received stitches for stab wounds to his thigh and buttock, later picked out Lindsay in an identity parade.
Mr Stephenson said the teenager was then "cuckooing" - taking over the homes of drug users - to avoid police.
Lindsay threw a man called Neil Fry out of his flat in County Road, Walton, which officers raided on March 24.
They found a shortened Beretta 20-gauge shotgun, 5.22g of cocaine worth up to £522, scales and snap bags.
Lindsay, of St Joseph's Crescent, Everton, who has no previous convictions, admitted inflicting grievous bodily harm, wounding and wounding with intent.
He also admitted two counts of possessing an offensive weapon, possessing a firearm without a certificate and possessing cocaine with intent to supply.
Daniel Travers, defending, said his client had gone "completely off the rails" over the course of a month, when he lost contact with his family.
The lawyer said Lindsay had a "very difficult childhood", grew up "without support from parents" and left school at 14, but his dad was in court supporting him.
He said: "All this needs to be put in the context that this is a very immature, vulnerable young man, who knows he's done dreadful things and admitted them."
Judge David Aubrey, QC, said Lindsay launched "totally unprovoked" attacks on three victims, adding: "You have a short fuse and a short temper."
He said: "You chose your victims quite indiscriminately. You had no regard to their welfare or indeed lives and you chose frequently to arm yourself with a lethal weapon."
The judge rejected the suggestion in a psychologist's report that he acted impulsively and said he was a "dangerous young man".
He said: "You carry a knife or knives for a reason and that is that if anybody crosses you, you have no compunction in using that knife."
Judge Aubrey sentenced Lindsay to nine years in a young offenders institution, with an extended four years on licence.
This means he will serve at least two thirds - six years - in custody, before he is considered eligible for parole.