Leaving Eretz Yisrael #2

It once happened that a Jew who lived in Eretz Yisrael had a brother in Bei Chuzah in Babylonia and the brother died. He therefore had an obligation of "Yibum" (If a man dies childless, his wife is expected to marry the brother of her deceased husband). He asked Rabbi Chanina: Is it permissible to temporarily leave Eretz Yisrael to fulfill the Mitzvah of "Yibum" and return to Eretz Yisrael with her? His Rabbi responded harshly and referred to widow as a non-Jew because she lived outside of Israel: "Your brother married a non-Jew and died. Blessed is He who killed him! And you are going to follow in his footsteps!? (Ketubot 111a, Tosafot on Avodah Zarah 13a and Shut Pri Ha-Aretz vol. 3 Yoreh Deah #7).