The Warlock's Immolation Spirits on live server still do not despawn after 10 seconds if they are healed right in the moment they actually should despawn. As a Soulweaver this happens quite a lot. This leads to a enormous number of Spirits following you around and attacking your enemies. Apparently you can also die inside a boss room and wait for the spirits to do the work.
Additionally there seems to be a strange interaction with the "Crown of the Undead"'s Necromancer's Command. I guess every attack of the Spirits counts as a daily use to repeatedly and over-trigger the CC effect resulting in footage like this one:
https://youtu.be/3SYMZJDMZvc