What to do after your mentor makes himself look like a Narcissist:

Rule 1: Don't read that as "looks like a narcissist".
Don't read anything the other peole are writing. Read exclusively in between the lines, on the edges and behind the screen if you must, interpreting the dialog as an attack on your mentor at all times, and especially if that's what your mentor responds as.
Rule 2: Use that version to rally people in support of what others did to your mentor.
Rule 3: Remark on how important your mentor is.
Rule 4: If calling the supposed aggressors names or referencing to them in any manner of diminutive remarks isn't enough, write a detailed narrative of their intent their actions, the more dumb, wicked or both, the better.

O yes, if you never spoke up when you had numerous chances, then make a post, never mentioning why you never came to the defense of your mentor before they were reduced to .. LOL! and 'You don't look stupid you troll'.

https://whaleshares.io/whaleshares/@thebugiq/when-dingos-circle-lions