A TULLIBODY man is facing a lengthy jail sentence after slicing his victim's head to the bone with a "monster" spear inspired by Alien v Predator.

Calvin Bourke left youngster Aaron Stubberfield, then 17, covered in blood during the brutal attack, which took place in Denny in December 2015.

The former squaddie attacked the teenager with the massive 27-inch spear, slamming the weapon down on his skull from behind, leaving a deep laceration.

He also slashed open his cheek and plunged the blade into his side, rupturing his spleen.

During a trial at Stirling Sheriff Court, Bourke was said to have been acting along with his co-accused Stuart Scott.

The incident came after Bourke assaulted another man outside the First Down pub on December 6.

Customers were outside and Liam Cattigan, also then 17, had been standing chatting when Bourke turned wordlessly and punched him once, hard, on the left hand side of the face, then ran into a nearby flat.

The shocked crowd, including Mr Stubberfield, then saw Bourke and his co-accused Scott, also 23, reappear with the Predator spear.

Mr Stubberfield fell to the ground and Mr Cattigan watched "speechless in fear" as Bourke stood over him began slashing and stabbing at the teen with the weapon.

The victim was left with a full thickness cut on his scalp – through to the bone – that required 10 stitches; a ragged wound on his left cheek; and a puncture wound in his side that lacerated his spleen.

He spent five days in hospital where doctors saved his life, but he has been left permanently scarred as a result.

The youngster said in evidence that just before the attack, Scott had begun walking "intimidatingly" towards him, while Bourke stood behind him.

Somebody shouted, "run, Calvin's got a knife" and he felt a "thump" on the back of his head and fell to the ground bleeding heavily.

An ambulance was then called, and Mr Stubberfield said that as he waited with friends for it to arrive, with the wound in his side "pulsing blood", he thought he was going to die.

At this point, Bourke walked by and said: "If you grass, I'll kill yous all."

Bourke, of Tullibody, Clackmannanshire, admitted possessing cocaine, assaulting Mr Cattigan, and showering racist and homophobic abuse on an Irish-born police officer who dealt with him at Falkirk Police Office after his arrest.

Together with Scott, of Denny, he denied assaulting Mr Stubberfield with the spear to his severe injury, permanent disfigurement, and danger of life.

In evidence, he blamed Scott for taking the weapon out of the flat.

Bourke said: "Stuart grabbed the sword and ran past me shouting 'these c***s want war'."

He said he had not seen how Aaron got his injuries, but added: "I can only presume they would have come from Stuart Scott using it."

Scott did not give evidence, but lodged a special notice claiming that anything he did do that night would have been in self-defence.

He told police the weapon was "like a Predator spear – a mad spear", from the movie.

It was later found by police, still smeared with Mr Stubberfield's blood, stashed behind a fireplace in his flat.

He added that before going out that night he and Bourke had "skelped" a 1.5L bottle of Captain Morgan's rum between them in his flat, then spent £80 on drink in the pub.

Bourke had also snorted lines of cocaine.

A jury of 13 women and two men, who were shown the weapon safely encased in plastic during a trial that lasted six days, took less than an hour and a half to find them both guilty.

Prosecutor Sarah Lumsden said Bourke was a bully and a "a violent, angry man".

She added that, Bourke was high on drugs and "absolutely raging" that a group of teenagers should have stood up to him over his initial unprovoked assault on Liam Cattigan that he had "whacked Aaron Stubberfield on the back of the head with that monster of a knife" and was lucky he wasn't on a murder charge.

Sheriff William Gilchrist deferred sentence on Bourke, now a construction worker, and Scott, unemployed, for reports.

He continued their bail, but warned: "This is a very serious case, and a custodial sentence is almost inevitable."