Q. It says in the Mishna Berura not to leave until the end of davening (siman 55) unless he heard all the kaddeishim until aleinu. May one be lenient with this when leaving to go to another shul where they struggle with a minyan and one was asked to come there (although one prefers to daven elsewhere but he wants to go there after having davened to help with their minyan)? Is it necessary to announce to others why one is leaving to avoid chillul Hashem?
A. Horav Shlomo Miller’s Shlit’a opinion is that you are permitted to leave after Aleinu and all the Kadeishim until then were recited, to go and complete another minyan. The Rov added that it is sufficient if you tell even one person before you exit the reason why you are leaving early.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a