So I'm curious, I'm a raid leader in my guild and I have both 10 man and 25 man LK defeated. We were a 10 man guild throughout wrath. Is it possible for me to lead a raid that goes 11/12 reg 10 man icc and then switch it to 25 heroic for 25H LK? I remember hearing something about having to defeat the end wing bosses on H to activate H LK for 10 or 25 respectively. Any help?