This is probably well known, however due to a hotfix in 5.4.2, where Blizzard were addressing Hisek firing his aim off if he or the player died, any threat dump ability now drops Aim completely, and doesn't fire.
This includes vanish (Rogue), Spectral ***** (Priest), Invis (Mage), Feign Death (Hunter), think a feral druid has a talent for it as well. Any threat dump, essentially. It's saved us some trouble this week on HC.