That's just lovely, then; watching fellow wizards is always a good source of both entertainment and inspiration.
What is she willing to perform for him?
It is always a good idea to make sure you dont get stagnant, your skills may dull.
He is more then welcomed to, if she can perform for her students, she can for him.
Guess he should try his hand at a breakthrough, then. Perhaps he's been content with the Ninth Circle for far too long.
Would she allow him to join in spectating one such training session?
Depends, each person should find what works for them.
For her, she does harder spells, and hold them for a while before taking a break, doing smaller spells in between.
@Avatarchivist Indeed.. Just incase, its always handy to try to carry something with you to help recover afterwards,
Example A, I always carry pocket blood bags..!