A 14-year-old boy has been charged with felony assault after allegedly beating a 66-year-old usher at a NBA Youngboy concert in Kansas City.
The teenager, who cannot be identified due to his age, was arrested soon after the attack on Thomas Schlange on September 21 at the T-Mobile Centre.
According to Fox 4 News, he was then charged this week.
Having worked at the arena for 17 years, Mr Schlange said he was happy about the charges because "accountability is important".
However, he told Fox 4 News: "But [it's] actually kind of sad things got to this point.
"Restraint, cooperation and respect are important lessons to learn."
The usher said the attack unfolded after he asked the boy to move because people had complained that he was not in his assigned seat.
However, in response the teenage threw him over the seats and punched him multiple times while he was on the floor.
Thomas Schlange, 66, was working as an usher when the attack unfolded
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After the attack, he told Fox 4: "I mean, it is serious; I went down and had blows to my head.
"He was so enraged, so we were just, in essence, trying to protect the fans."
Mr Schlange still does not remember much of the assault, and feels emotionally shaken.
His grandson, Herber Lopez, set up a GoFundMe to help support him while he is unable to work.
Footage of the incident taken by onlookers has sparked fury online
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Mentioning Mr Schlange's previous diagnosis of glaucoma, and concerns this may now get worse, it has so far raised nearly £10,000 ($13,403).
The boy was eventually dragged off the 66-year-old by an onlooker, while others filmed the incident in footage which has since sparked fury online.
One such onlooker was Robert McDaniel, a local pastor, who told the Daily Mail: "He beat him up because his ticket was in another section, he broke his nose.
"I'm trying to get these kids help. They are children. Not saying they are innocent, they don't have logic or common sense.
"We have an epidemic of these boys not being taught how to process through these emotions."
A spokesman for the arena called the attack "horrific", adding: "This isolated incident does not reflect our venue, our city or the thousands of guests of all ages who enjoyed the show without incident."