This continues for EIGHT MOTHER OF GOD D- WHAT THE H- TIMES!
Everytime I re-explain the mechanics and tell healer how to not F-up(hint: stay away from swinge-ing side of dragon)
I stay out of respect for the trooper SMN(was QC rez on dead healer), the MCH makes some BS up and RQs.
Poor SMN asks if MCH had something to do. I explain what a rage quit is.

Eventually healer quits, a real healer joins, and we slam dunk rest of run, with only 30 seconds left to spare on clock.

TL;DR version: What's your tolerance for new players who REFUSE to learn mechanics?