[Help] A question on curses

[lumineth Realm Lord]

So, if I were to curse someone, you should understand that it'd be out of self preservation purposes, or in regards to an unjust or unlawful act. As in to say, something that has a practical and negative effect on myself or other people. Not out of sheer spite of hatred.

I wanted to ask this. If I were to curse someone, would that mean the energy would return to me? Or just if it's done out of hate? Is there a way to magically act offensively to someone who poses a threat?

I'm not in the position where I'm needing to do that. I'm asking in preparation.