Looking at our S1 PK Ranks as i post this..Was this some time ago this happened? Was this just a one time/day thing? Our player currently in first in PK Leader Board is a lvl40 with a pk value of 20.
This pk value declines over time, so that could be why, however the first 5 ranks are all lvl40 and under.
It is possible your friend was set to guild mode, in which changing modes to peace mode would have resolved this issue. Also note if your friend was red named themselves then another would have been more inclined to atk/pk them. Being followed/camped repetively by any individual to pk you can be considered a form of harrassment, next time this happens make sure to ss EACH occurence and submit them within a ticket detailing the situation. A single ss of this would not be enough to prove the offense. However SS'ing EACH occurence may lead to a more satisfactory result in regards to a report. I have worked with the GM's on reports and they have always been fair in their decision making. We may not always agree with the outcome, but they really do try to remain fair. If after you submit a ticket on an incident like this and then the player continues to perform said actions against you/your friend, re-open the ticket and update it. Further actions may need to be pursued. G'luck in your ventures and enjoy the game. Not everyone is a PK'er.