Raja Jackson , the son of former UFC light heavyweight champion Quinton "Rampage" Jackson , went beast mode during a match Saturday night ... violently attacking his competitor with blows to the head despite him already being knocked out.

The disturbing footage from the event's Kick livestream shows the victim -- Stuart Smith , whose ring name is Syko Stu -- being slammed to the ground ... a move that seemingly knocked him out cold. Raja then mounts his unresponsive body, delivering hit after hit until he's pulled off. Kick/Rajaplus

The incident occurred at a private wrestling event by KnokX Pro Academy in Los Angeles, and according to wrestling reporter Sean Ross , Syko ended up in the hospital.

Ross claimed on X Saturday the spot was planned, but the heavy blows "were not

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