A 14-year-old accused of being the young thug filmed viciously beating up a 66-year-old usher at an NBA Youngboy concert has been charged with felony assault.

The teen, who has not been identified because of his age, was first arrested soon after the attack on Thomas Schlange at the T-Mobile Center in Kansas City on Oct. 17, before being charged this week, Fox 4 News reported .

Schlange said he had just asked the boy to move, because he wasn’t in his assigned seat — just for the teen to toss him into a row of seats and unleash a barrage of punches.

Schlange — who has worked at the arena for 17 years — said he was happy charges had been pressed because “accountability is important.”

“But [it’s] actually kind of sad things got to this point,” he told Fox 4. “Restraint, cooperation and

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