Reviving Enemies

I was in the cultist village in act 1, and two "Cultist Daggerdancers" - minions of a rare elite - were chasing me. No problem, I shot them to death; except they immediately revived at full health. At first, I thought this a mechanic of the rare elite witch who was behind them, so I focused on her, but even after she died they kept reviving. They chased me across the entire map, each time I killed them they would just instantly revive again. I had to close the game to reset them, rather than try to find a way to complete the boss with two enemies constantly rushing my ranged character.

Faced similar constantly reviving monsters at other acts. Reviving flies at Act2 Mines, flying bugs at the first location Act 3, Rats at the dungeon with soul cores.
They just continue to revive. The only thing that helps: go to Waypoint and reload instance.