In my opinion, Umar234 is mainly responsible for Faseehch's head injury because he was riding on the wrong side of the road at high speed and lost control of his motorcycle. His dangerous and careless driving caused the accident.
However, Faseehch should still be fined for not wearing a helmet because wearing a helmet is required by law. Although he did not cause the crash, the helmet might have reduced the severity of his head injury.
The police should file charges against Umar234 for reckless driving, speeding, riding on the wrong side of the road, and causing serious injury through negligence. The law should treat this as a serious traffic offense and take appropriate legal action.