If you use any means to harass or prevent a ghost from resurrecting and returning to their body...
To be clear, there is never a situation where it is acceptable to slow down an aggressive enemy from returning to attack?
-Someone who is dying, immediately resurrecting at a nearby ankh and returning to attack, over and over, in order to harass your Felucca PvM experience. Perhaps with 3-5 insanely powerful donation pets. Going by the history of the server, this would be classified as griefing. So you can run away, page, and cross your fingers something will be done (hint, don't hold your breath), or attempt to handle it within the current mechanics of the game and finish what you were doing.
-In a battle where your team is greatly outnumbered and anyone with an ounce of strategic thinking would want to slow down the return of fallen hostile players.
Everyone might take a moment to critically think why in a heated PvP encounter, with 8+ people in the area, someone might not spend crucial time considering who has just resurrected, who is or isn't a threat, etc. Consider that not everyone plays this as UO Farmville and might actually have a strong competitive drive to win. I've made the comparison of the mindset in PvP to that in a boxing match. The opponents step into the ring looking to take the other's head off, not for a couple rounds of slap-and-tickle. When one is knocked down in the ring, the other doesn't give a hand to help them get up, apologize, ask them if they should play nicer. No, as soon as they are on their feet, it's time to rearrange the other's face again -- until one submits and does not return to the fight.