Keep talking to him, try to discourage him from riding and get an ambulance. If he rides off anyway, at least you tried to help.
If you were ambulance personnel/police and determined that he could not help himself or was a danger to self/others, then you would stop him from doing anything as consent is now implied.
The initial head injury and how it will progress is mostly unpredictable until you get the person to a hospital and get a CT scan. I think its better to side with caution and action with regards to consent (be careful about how you treat another's autonomy) and how you treat the injury.
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