Quote from: Daelo (Source)

We've just deployed a hotfix to all regions that changes the targeting behavior of Kil'jaeden's Soul Flay ability. The ability now has a much simpler rule to determine who will be targeted.

Soul Flay now targets the player with the highest threat against Kil'jaeden, regardless of the distance between the player and Kil'jaeden. The normal threat buffer that prevents a creature from changing targets to someone outside of melee range does not exist with Soul Flay. Soul Flay will still not target a player who is immune, however.

This change will likely change some of the strategies currently used by players against Kil'jaeden, but our intention is not to make the encounter any more or less difficult. This change should result in a more consistent, more understandable, and more enjoyable Kil'jaeden fight.