Something I'm getting fed up with

[Adire]

...and to point out, the Flash icon is darkened out when I'm in that dungeon.

I have the same problem in some dungeons with SCH and Stoneskin. Try moving Flash to one of the first cross class slots. I've been told the later the slot a skill is in, the earlier a skill is level synced.

Anyways, if you've been explaining to people what to do and they haven't been listening or have gotten offended for a dumb reason, that's on them. I wouldn't worry much about it. You should explain what to do to people, especially if they're new though. That fight is the first one in the game to introduce instant death mechanics, so it's important to explain since it's quite different from fights up that point.