Why does a headbutt hurt less when you're the one doing it to your opponent?

Whenever I gave someone a light headbutt back then, it hurt me less than it did the other way around, whereas every time I had a severe headache, the other person didn't experience any of that pain. But according to Newton's third axiom, the law of interaction, the same force with which one hits something…

Does a phase shift occur in the current and voltage together or individually, with an inductive and capacitive load?

So I know that a phase shift (reactance) in an inductive load causes the current to be phase shifted and in a capacitive load the voltage to be phase shifted, which creates reactive power. But I thought about it a bit more and came to the hypothesis that with an inductive or capacitive load both…