At seudah shlishis at shul, this week, the person leading the bentching (grace after meals) neglected to say the word "Elokeinu" (our God), in the invitation to bentch ("zimmun"), as is required when ten men bentch together.
What happened was that everyone else responded with "Elokeinu," and the mezamen (person leading the bentching) was waved on, told to continue from that point on.
What should have happened? Should the other people have responded, or should they have waited for him to correct himself? Once the others answered, should the mezamen have continued from that point on, or should he have gone back to the line in which he skipped "Elokeinu"?