In various instances player loses grace period before minions. That way player is attacked by enemies, but minions aren’t doing anything.
One example: Lagon fight in Ending the Storm quest line.
When Lagon gets to 50% HP, player is teleported away to kill tentacles and dodge waves.
After killing enough tentacles, player is teleported back to Lagon.
Lagon starts attacking player, but minions do nothing for couple of seconds.
Related issue:
Wraithlord doesn’t lose grace period when you do