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A martial arts instructor choked terrified pupils until they collapsed unconscious.

Steven Grant, 29, put two schoolboys in choke holds cutting off their air supply.

The boys had to be revived with smelling salts but Grant offered to buy one of the boys a McDonald’s meal if he let him repeat the “dangerous” manoeuvre.

Police were brought in when the teenagers told their parents how they passed out in the class.

The mother of one of the boys said it was lucky no one was killed in Grant’s lessons.

The judge in the case called for a nationwide investigation into martial arts classes run by unqualified instructors.

Prosecutor Robin Rouch said: “One of the boys turned up at the lesson angry after falling out with another boy and wanted to knock him out.

“Grant said he would show him what it felt like to be knocked out.

“He demonstrated it on the older boy who was put in a choke hold from behind.

“The next thing he was aware of was waking up on the floor.

“He came around in a state of panic and needed smelling salts.

“Grant offered to show him again and said he would buy him a McDonald’s if he did it.”

Swansea Crown Court heard the boy was not fully knocked out the second time but needed smelling salts to be revived.

The younger boy was also put in a choke hold at the Slicks Club in Milford Haven, Pembrokeshire.

They had paid Grant £5 a week for the martial arts lessons last year.

A victim impact statement heard the mother of the older boy sent him to Grant because he was being bullied at school.

Grant admitted two charges of causing actual bodily harm to the schoolboys who can’t be named for legal reasons.

He was given a six month suspended prison sentence for two years and ordered to carry out 150 hours unpaid work.

Judge Geraint Walters told him: “What you did was very serious and should never have happened.

“You were in a position of power - parents trusted you with their children as they had every right to do.

“But you applied choke holds and one of the boy’s legs wobbled as he was rendered unconscious.

“You did that twice to him and once to the other boy.

“Smelling salts had to be used to bring the boys around.”

Judge Walters said it was remarkable that martial arts lessons could be given by someone whose only training was learning the sport for themselves.

He said: “Someone needs to look into how these classes are operated so the risk of this happening again is managed in a proper way.”

Grant, of Milford Haven, was given a restraining order preventing him from having any contact with the boys for seven years.

One of the boy’s mothers said after the case: “It was lucky my son wasn’t killed - what happened was extremely dangerous.

“I’m pleased he has accepted his guilt for what happened - I don’t want any other child to be exposed to that risk.”