So, I began running raids in my guild, for things such as Ulduar 10/25 drakes, ToGC achieves, and other various achievements to be had. Now, people in my guild want to complete Heroic Lich King 25. It's the only boss we didn't get to kill during Wrath, cleared everything else on Heroic 11/12 ICC. Just never got to kill Heroic lich King.
My question is, can you clear 11/12 ICC 10 normal and then switch it to Heroic 25? I've had a few people tell me you can do it, and it seems to be something that would work considering 10's and 25's are the same lockout, and if you kill a boss on Heroic your already saved to that particular instance or something.