User blog comment:B214/Volume 23 discussion blog/@comment-81.135.248.15-20170321230737/@comment-30048084-20170322200330

Sona will help Issei in her own way by schooling him in the match. She might tell him where he failed after the match but she won't tutor him.

I think considering it is Sona's Peerage Issei might be noble and not use his 'special' techniques on them(he can search for other times to strip them). Issei should learn to be able to fight without using those techniques because in normal Rating Games they would be forbidden. If he did that he might make himself a few fans especially if he says it out loud before or at the beginning of the match.