"You appear to me, Mr. Darcy, to allow nothing for the influence of friendship and affection. A regard for the requester would often make one readily yield to a request without waiting for arguments to reason one into it. I am not particularly speaking of such a case as you have supposed about Mr. Bingley. We may as well wait, perhaps, till the circumstance occurs before we discuss the discretion of his behaviour thereupon. But in general and ordinary cases between friend and friend, where one of them is desired by the other to change a resolution of no very great moment, should you think ill of that person for complying with the desire, without waiting to be argued into it?" (Chapter 10)

I cannot help but relate this conservation with the tolerable incident in Chapter 3. Darcy certainly does not yield to the request of a friend at that time. What about this conservation bothers Bingley before he jumps in to end it? Lizzy and Darcy are certainly disagreeing but there are no exclamation points used to show they are getting too excited. Is Bingley afraid somehow the tolerable incident will come up and he wishes to avoid it? Is JA just showing us why Darcy did not yield to Bingley in Chapter 3? ;D

"By all means," cried Bingley; "let us hear all the particulars, not forgetting their comparative height and size; for that will have more weight in the argument, Miss Bennet, than you may be aware of. I assure you that, if Darcy were not such a great tall fellow, in comparison with myself, I should not pay him half so much deference. I declare I do not know a more awful object than Darcy, on particular occasions, and in particular places; at his own house especially, and of a Sunday evening, when he has nothing to do." (Chapter 10)