Please paraphrase. What does "there was air coming down" mean here? Thanks ?
Father: After the bird show you saw them. And were the butterflies flying around all over the zoo?
Boy: Uh, um, they’re inside.
Father: They were inside, what, a little building? [Yeah] What was the building made of? Was it made of wood? [No] What was it made of? [Glass] Oh, made of glass. And couldn’t the butterflies fly out of the glass? [No] No, oh, what stopped them from flying out?
Boy: Um, the air.
******Father: Oh, the air. Oh, there was air coming down? [Yeah] Oh, well that’s great.