moshe rubin asks:
The gemorrah brings a ma'aseh whereby R' Assi put Shilah in cherem for not retracting a psak in accordance with Rav because Rav himself changed his psak later on. However, it would seem that unless Rav was to'eh b'dvar mishnah, his initial psak as regards shila would still be in effect (unless perhaps shila knew rav's din but never asked him the sha'aleh directly?)
moshe rubin, brooklyn, ny
The Kollel replies:
I agree with your answer that this was not a case of Shilah ruling because of an answer he got to an actual personal question that he asked. Rather, he heard Rav say that this is what he holds in this matter.
All the best,
Yaakov Montrose