We’re implementing a bugfix this week that should go live with server restarts in this region early tomorrow.
Fixed a bug that caused creatures such as Solenor the Slayer to misbehave when pursuing the player. Groups of creatures that commit to combat as a group will now all continue to pursue whenever any one of them are struck by a player attack or ability.
After restarts early tomorrow, Solenor the Slayer should no longer reset if the player strikes the adds that he summons while he’s rooted, or if the player strikes Solenor himself. And now, if you aggro one of a group of creatures in any zone, and then you keep occasionally hitting any one of them, the whole group will follow you across the zone.