Hello sir. My friend was learning riding a himalyan bike..but he drove

Hello sir. My friend was learning riding a himalyan bike..but he drove like accelerating a bike by putting rear brakes. I don't know what happened to bike coz when i drive it gives me crazy noise when i accelerate it or put a heavy gear as if some thing is continuously rubbing against each other.I checked everything such as chains, wheel everything but the issue isn't gone.. can u please help me what is the issue.

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