Thuban, on that post you linked and with regard to the scenario I mentioned above...
Thuban wrote:
If you wish to engage in PvP against someone who doesn't fit the above criteria, you absolutely must take time to role-play with them first. They must understand that they are being targeted and have a chance to enjoy some role-play with you before you take their head off.
If this is your stance, you should really revise the helpfile which does not, in a reasonable reading, imply that you have to announce your intentions to murder someone before you murder them. Yes, you should RP in that you shouldn't knowingly run up onto a PC and attempt to kill them without any meaningful interaction, but I don't think that the current helpfile indicates that you have to clearly demonstrate IC that your goals are sinister before attempting a kill. There's plenty of leeway to assume that you could, for example, say "Hey, nice ring. Can I buy it?" And if they say no, to lead them into a trap, for example.
According to the quoted text from you above, my scenario above where a evil person interacts with someone and then hits them with a surprise attack would be against the rules. I don't think the helpfile makes that clear, and to be honest I think that removing the possibility for evil characters or even good characters to make surprise attacks is wrong; If anything it's very sensible to think that isn't the case, otherwise the parts of the paladin code and hellion code that require them to declare attacks before they issue them is redundant.