I finally decided to play this game and along the way I got to Kilpatrick's office, accepted his quest and had the brilliant idea of using him to feed. I went on with my game doing a lot of other quests on the way and left his for last. When I finally decided to finish his quest and got to the part where I have to "report back to kilpatrick" I went back to his office to find out that he wouldn't talk to me anymore, he just stands there in the corner, he's not in that post-feed trance anymore, he's just standing there with his hands up and all scared, and the talk-to icon doesn't show. I thought "ok it's just one side-quest, no big deal", but then I checked game banshee and found out that I still get 2 additional quests from him with money rewards and extra weaponry from the pawn shop, also, being my first playthrough I want the whole experience and wouldn't want to miss any part of the game.
So, is there a way to fix this without having to look for a much older save file or starting all over again?
I had done the same thing with doctor Malcom and none of this happened, I can still talk to him and I was still able to finish his quests afterwards, that's why I thought it would be ok to do the same with kilpatrick.