That's like saying that you can't remember how to multiply 2x4, i am pretty sure you learned that nearly 10+ years ago. I've played this game since beta and sure some of the trials you run more than once when they are new in min ilvl etc, some trials/dungeons you don't run for 2+ years and yet I still remember them.
Good for you. Not everyone does. Mentors don't necessarily mean they're stellar players that never get hit, either.

If that's what you expect out of someone just because they're a mentor, you're going to continue being disappointed.

I have no intention of debating with you to even page 10, let alone 100, because that's really all there is to the matter.