Kingdom of the Sands, Madness, Strange Believers - undead?

[Trystangst]

The enemies in this map die, then get some health back while staying dead. They can still be targeted and will attack until you kill them a second time. Only time I've encountered this. It happened with the minion dogs as well as the "boss".

[Kaijester]

Do you happen to be using any character named Angel of Fear/Pain/Strife?

There's a known issue with these character unable to do the final blow and causing this undead enemies.

[Trystangst]

Ah - that have may been it. Used a trooper's Angel of Strife.