This happened a couple of days ago but for some reason I keep remembering it. And it makes me go ??? every time. We don't get many "lovely" experiences in DF on Cerberus.

Friend (WHM) and I (DRK) queue for levelling roulette and get Tower of Babil. Cool. Our two dps were a sprout RDM doing this for the first time and a mentor DNC. Everything goes relatevely well until the first boss. The lil sprout quickly learns the mechanics and proceeds to do almost everything correctly. The mentor, on the other hand, kept getting hit by every single mechanic and dying. They died 3 times on the first boss alone. It was so ironic to us we actually got a good chuckle out of it. Till it stopped being funny for the other bosses. Not only did it seem like they were going out of their way to die (because I can't imagine someone consistently screwing up so much) but they also appeared to have no idea how to play dancer. Absolutely never used Technical Step and waited approx. 10-20 seconds to use standard step after it falls off as a buff. The run still went somewhat fast thanks to the RDM knowing what they're doing and the holy/glare/misery spam but damn.

At this point I am convinced the mentor icon is a red flag.