I am looking for sources/responsa that deal with a Rabbi's moral obligation towards his students - eg. a moral imperative for him to stay with his talmidim, or to continue his relationship.
Specifically, I am searching for a sourced reference to the Gemara (Makkos 10a):
תלמיד שגלה מגלין רבו עמו שנאמר וחי עביד ליה מידי דתהוי ליה חיותא
When a student is exiled, his Rabbi is exiled with him
Does anyone infer from here that a Rabbi should stay with his students, even at the expense of his own personal reasons?
[The famous story about R' Elchonon Wasserman returning to his community during WW2, and This question came to mind.]