I do have a bit more info on the killer rabbit..........I had an idea on when it was triggered. the trigger is when you meet up with talana. while in broken valley, I killed all the rabbits....there are 25 in the area. after I met up with Talana, I killed five more.......and when the fifth one was killed......".oh...the killer rabbit!" she also says "oh....you killed a bunny..." but yes, the Bandit Camp is the perfect place to dispatch him. withhold the information on the bandit camp until after you did all you need to do in there {you can get some very nice stuff in there}. kill all the chickens, but be careful

tell the Ltn. about the location of the Bandit Camp and head over there. if your aggressive enough, you can get most of the experience points for killing the bandits. when you trigger the Killer Bunny, make sure there are enough soldiers around, so they can surround him and keep him from jumping about. that is how he regenerates himself.....and he does this very quickly! it does take a bit of time to kill him, but have a good bow and it will shorten the assault. also.......depending on how many soldiers that encircle the bunny, it will have an affect on how much experience you get for the kill. if you have him, you can use your creature to help, but he dies rather quickly, so it's useless to use him.
another thing I found, is that Willie does have a stash......if you mind read him. it's in the goblin camp.......that's all I will say
