You touched on the artery of this thing called griefing. Grief is an emotion and even the stuffy overly scientific psychologists recognize that each inter human transaction is a transfer of energy called the "Stroke Count" Griefing can be anything that a CMDR would not expect (unmet expectations) from another spirit enfleshed CMDR to do and its in that very act of allowing an assumption to rise in ones mind that places the grief button on ones self for griefers to push which causes the bleedout of emotional energy and believe it or not, this energy is taken and distance is irrelevant. All that is required for the griefer to absorb that liberated life force through the form of grief is their awareness of the act....if they are aware of the act they literally are touching this energy and since intent is already active through the choosing of the griefing act...your energy immediately transfers to them. You are literally being fed upon and depending on the magnitude of your grief, that amount of your most potent essence re power is now theirs. They feel it no less of a high than any physically consumable drug on the planet and that high / energy can and has been measured via the latest physiological equipment.
So, the end of griefing occurs when you drop assumptions as we do for NPCs. A NPC can ram scan you ...they can attack you without scanning your cargo and thus for no reason other than you are there; and since you didnt assume they would behave in any particualr way other than what does happen, you do not astrally or emotionall bleedout via grief.
Easier said than done which is why "make no assumptions" is one of the toughest of the popularly known "Four Agreements" to live by.
And that button is still installed for pushing if one applies assumptions that all CMDRs will do all things you dont want, in fact that places an endless number of them.
Dont think for a second that one whos acting from revenge can grief a griefer. The griefer does not have those buttons to push and will not therefore feel what you felt and to boot, instead of allowing the griefing act to come and go, thereby closing the emotional drain, the revenge act re-opens it full and the outflow is even greater.
So those playing in "Open" at least with respect to this topic, to the griefer they are babies playing on a battlfield, precisely becuase of how much inner self knowledge. power (not force or power-over another) and deidentification of external phenomenon is required to truly seal the astral re griefer actions.