One or more players are doing this dungeon for the first time.

[Ravnika]

Because I'm not their babysitter. Because I had to learn the fight myself. Because either newbies go in blind or inform BEFOREHAND.
I'm not their guide.

And yes, it's an unpopular opinion.

Yup, it is. I am praying that one day you don't take the 20 seconds explain the basics of the Nidhogg fight in Aery to a newbie and you die to Sable Price. A lot.