[bug] Blast from the Past story instance

[Wyrm.7926]

Going through the core story on a character, I noticed that during the level 80 instance "Blast from the Past" where you have to clear the staging area for the searing cauldron, there's a bug where the risen tendrils can be targeted before they are triggered to appear. Destroying them will trigger the next phase where you defend the cauldron. However, if you still had enemies to kill during the clear out phase, once that part ends the tendrils will still show up with the knights (which weren't targetable earlier) defending them. The knights can be targeted, but the tendrils can't (since they were already destroyed, more or less); they can however still fire at you and create the poison fields.