what about brich hu as a hefsek? can we get a shiur on saying brich hu (and why some say amein) in kaddish? where can you answer it? is like an amein?

In the Beis Hamidrash of the Chasam Sofer, the worshippers would answer “baruch hu u’voruch shemo” during the berachah before blowing the shofar, but the Chasam Sofer did not stop them.  (Shut Maharam Shik, Orach Chaim, responsum 51) A point for consideration is whether the Chasam Sofer would distinguish in this matter on the one hand between mitzvas shofar where the berachah is bircas hamitzvah and thus not l’ikuva, and on the other hand, kiddush, where the berachah itself is the mitzvah?

Rav Avraham Dovid ben Asher Anshel Wahrman – the Eshel Avraham Buczacz (1770 – 1840) writes (Orach Chaim chapter 66) that when he was the shliach tzibur he would say the ends of all the berachos (boruch ato…) before and after the shema silently, so that the tzibur would not answer “baruch hu u’voruch shemo” since it was forbidden to answer with these words at this part of the service.