If you get a punch to the head and you fall over, it is a hard punch.
If you get a punch to the head and you don't fall over, it's probably worth reporting, (if you are the "punchee"). but not a hard punch.
If you get a punch to the head, (and you deserved it), and you still don't fall over, then you should accept the fact that you have no idea about the concept of "airmanship" probably don't give a rat's about the owner, have a thick skull and will grow up to become someone I should avoid.
All this aside, look at the firewall and the fuselage. If you see something abnormal, like a bent piece of tin, and you have spinal injuries, it is probably a "hard landing".
Or ask someone about common sense.