Student or Learner
Please make the following in red clear for me.
Gary never asked a question of either of us, and made no attempt at anything that resembled a conversation. Jeanie had a client in his field, which she happened to mention at one point. If he had shut his mouth and listened, he would not have blown this lead from her. I had mentioned that I was writing this book, giving him a topic to bounce off of, but he lacked the interest to inquire about it.
Especially what does "lead" mean? A client?
not a teacher
In the context of selling and sales representatives, a "lead" is information that identifies a potential customer.
… "a topic to bounce off of" means a subject that gives him the opportunity to make a comment and enter the conversation.