There are many complex halachos about interrupting one’s prayers for various responses. At some points in davening, it is forbidden to respond, “Boruch Hu u’baruch Shmo.” At other points, one cannot even respond amein.

More on Kohanim

All of Kohanim Answering Amen to Birkas Kohanim Birkas Kohanim While Sitting Buying the Position of Kohen Gadol Giving Beef Tongue to a Kohen King Uziyahu and the Ketores Kohen at a Tzaddik's Grave Kohen at His Wife's Funeral Kohen Flying Over a Cemetery Kohen Giving Up the First Aliyah Kohen in a Non-Jewish Cemetery Kohen Ruling on Tzaraas Lottery for Kohanim in the Beis HaMikdash Matanos Kehunah Outside Eretz Yisrael Matanos Kehunah to a Kohen's Daughter Obligation to Hear Birkas Kohanim Reciting Pesukim During Birkas Kohanim Rotation of the Kohanim's Shifts Seeing a Kohen Doctor Standing for Birkas Kohanim Using a Kohen to Serve You