I found a video on youtube with a tutorial how to do this glitch, sadly it didn't seem to work. After a couple of minutes trying different things i found my own method to reproduce it. I use it to kill BKs and Kristallons. The problem is that I have no idea what causes the glitch. The method i'm using doesn't work all the time, so it's kinda risky to try to use it on BKs. If someone knows what causes the glitch, i'd love a PM with an explanation what causes that glitch, so i can make my method a little bit better.