"Where are you, Bob?"
Translation:أَيْن أَنْتَ يا بوب؟
On laptop computer it was in the regular first part. Perhaps it works differently with iphones? [Addendum to your response to avoid piling up back-and-forth: That's interesting that it's that way for you. I don't know why it wasn't that way for me. I hope it gets resolved.]
I read that Duolingo was running an A and B test group to determine which presentation of lessons works better. If this is true, maybe you are in a different test group than we are. I do my lessons on a computer and I have sound both in the discussion and in the exercise.