Hello, in 3.3.2, they've implemented a new spell that, if your within ~40-50 yards of the Lich king, would pretty much wipe your party. (This will happen to you if your doing the ledge method)
Pain and Suffereing - Wowhead Search (You see him casting this now if you observe him during the LK event chase, looks like purple beams.)
Well, I found a simple way to avoid this! Instead of standing near the ledge, make sure your party minus one person stands near the southwest side of the throne room. Once someone has talked to jaina / sylvanas, have that person run to the southwest side of the throne room, back to the group.
Now, deal with the first wave in the event in the throne room, while still keeping a solid 40-50 yards away from LK. Now, once the first wave is down, you can now run out and follow him as he chases jaina / sylvanas! (while still keeping distance from him)
Ps, the devs must of been in a hurry to put that spell in, because they misspelled 'suffering' :P