1. There is no case standing against you since there has been no injury at all,

2. Moreover, there is no evidence of any of your misdeed to implicate you,

3. Make sure you refute any charge levelled by him in future claiming that he is levelling false charges to extract money from you,

4. For such accidents, there shall have to be police case which is filed after lodging FIR against crime committed. Rash driving causing accident and injury is an offence. Hitting someone unknowingly while opening door is no cognisable offence,

5. No case will stand against you, if filed by him for the said accident,

6. Neither you will loose your driving license nor your PG study will get affected with this incident,

7. Your approach should be to go to denial mode about the incident and to react according to the step taken by him.

1. This is a common tactic employed by the injured in road accidents to extort money.

2. He can file a case for rash driving and hurting him against you but you need not worry as you will be given a chance to defend yourself. The court will not accept his case on the face value.

3. Nothing adverse will happen to your career as you have not committed a murder.

4. Driving license cannot be cancelled.

5. The next time he calls you for money tell him to go and file the case if he wants to. Refuse to pay any compensation.

1. Refuse to own any liability to compensate this man.

2. Let him go to court if he wants to.

1. You are thinking whether it is morally correct or legally correct?

2. Since there is no evidence of the incidence and also that the victim did not report the mater to the police which he should have done legally, then it is perfectly legal to seek evidence in support of his allegation and deny and dispute whatever he alleges save and except what are in records,

3. If you go morally, take him to local laboratory personally, get him exemined thoroughly and bear all his expenditure since you have illegally caused injury to him without any of his fault,

4. You can take both legal and moral ways as suggested above.

Since there is no external injury to be proved, so if he files a police complaint, let him do so. The police will get him examined and will register FIR. On the other hand, you could file a case of criminal intimidation if he calls and gives you threat that either you pay or he will file a complaint. there you could deny any involvement in an accident, etc.