9. Not to answer Baruch Hu Uvaruch Shemo:^[1]

Whenever a person has in mind to fulfill his obligation with a blessing, then he is not to say Baruch Hu Uvarach Shemo upon hearing Hashem’s name said in the blessing.^[2]

Bedieved if said Baruch Hu Uvaruch Shemo: In the event one said Baruch Hu Uvaruch Shemo it is possible that one has not fulfilled his obligation of the blessing.^[3] For this reason it is imperative to warn the public of this matter, as many are unaware of this.

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[1] Admur 124:2; Degul Merivava, Chayeh Adam and other Achronim brought in M”B 124:21; See Shraga Hameir 5:55; Piskeiy Teshuvos 585 footnote 29; 124:11 footnote 106; Mishneh Halachos 13:16

[2] The reason: Whenever a person is hearing a blessing with intent to fulfill his obligation, such as by Kiddush, Havdala and blessings over fruits and Mitzvos, he may not answer Baruch Hu Uvaruch Shemo, being that one who hears [and fulfills his obligation] is like one who is saying it himself and it is forbidden to make an interval in the midst of a blessing. [Admur 124:2 in parentheses]

[3] Admur ibid; Chayeh Adam brought in M”B 124:21; See Shraga Hameir ibid that in such a case he also missed the words “Elokeinu Melech Haolam of the person saying the blessing; See Minchas Elazar 1:20

The reason: It is possible that even Bedieved one does not fulfill his obligation as since he made an interval between Hashem’s name and Malchus with words that were not inserted by the Sages he has therefore swerved from the wording of the blessings that was set by the Sages. [Admur ibid in parentheses]

Other opinions: Some Poskim rule that if one answered Baruch Hu Uvarach Shemo he nevertheless fulfills his obligation. [conclusion of M”B ibid; Mahram Shick 51; Birkeiy Yosef 213:3 in name of Mahrash Abuhav; Piskeiy Teshuvos 124:11 and 585:3]