Comment by Random Passerby

Oh, side note, but I really don't remember if we ever got an answer for this?

Could Xira, theoretically, learn Handsign really fast by lifting it out of someone else's head? And could he use his mind magic on himself? Like, could a witch erase their own memories if they had the urge?

Reply by Shazzbaa

Oh boy!
(1) Straight up transferring a memory from one mind to another isn't something we've seen in the comic so far, so we don't know. That would theoretically be within the purview of mindreading??? though probably complicated.
(2) Recall that the Elemental in chapter 3 quickly remembered Jonan more and more as her memory got jogged, because Xira didn't have time to hide loose ends -- he referred to the job as "sloppy." Now ponder how hard it'd be to do a more thorough job when you forget what you were doing half-way through!
I can't say it's impossible, but it wouldn't be as simple as pointing the spell at yourself.