the little I know:
(You’re assuming that the rebbi has indeed done something wrong. Anyway:)
What’s this about obligation to wait for the other person to apologize first? (I’ve never heard of such a thing…)
What about obligation to apologize first?
Would it be beyond reason to suggest that the person with a greater obligation to honor the other apologize first, namely, the student?
Besides, in this case, the school/yeshiva has the power, and they want the boy to apologize. To start a you-go-first standoff seems counter-productive to me. (Call me a defeatist if you want to.)
old man:
The minhag hamakom, or the practice of the Ponevezh yeshiva?
It can’t be both, unless either the makom is the Ponevezh yeshiva, or the practice of the Ponevezh yeshiva is to follow the minhag hamakom, which seems meaningless here.
So, what exactly do you mean?