Rule 5.8 is: A player who was killed in a PvP fight must not attack the enemy (character or characters involved in the death) with any of the characters on his/her account(s) for 2 hours. Self-killing, friendly fire kills or death to NPCs during a PvP fight are counted as normal PvP deaths.
Here's an example of an unknown situation.
A player has 2 chars, named A and C. He logs account A, which is a Wraith, and spots B, a Thor. A then kills B in a short fight. B soon then joins a Hessian raiding party against Corsairs in Omicron Gamma. A logs off and switches to C, a Corsair Titan, who then soon joins a Corsair fleet. C then spots B and engages him.
