Previous Killing Blow % must be kept to less than 10%, however, really you could make one kill and have it be the killing blow and be immediately at 100%. For the nature of this challenge, the Killing Blow % just doesn’t make sense the way it does for the Iron Man or Blood Thirsty challenges.
Keeping with the spirit of the challenge we’re now going to be looking at Total Kills. As a Pacifist Challenger you must never take the life of anything… even if it’s a critter! Be wary of what quests you take and what you are smashing! Because of this change certain classes will be impossible to level (eg. Death Knights). I may put in a tolerance to allow Pandaren, Worgen and Goblin characters to leave their starting zones but for the time being we’re going to stick to a flat 0.
If you are seeing that your character was flagged for kills, I’d ask that you have a look at whether you’ve checked the Display Character Achievements Only option in the Interface / Display settings. If you find any discrepancies, please let me know and keep in mind… I’m working with the data that Blizzard is giving me! 🙂