Miles has been babbling for months, but in the past couple of weeks, he's started holding conversations with people. Or in this case, a meeting.
Generally, the process goes something like this:
Miles begins with a very strong statement. Usually, "Abadugabadah" or similar.
Then, it's your turn to speak. And you'd better respond correctly. "Is that so?" or similar is acceptable. Say something along those lines, and the conversation will continue in the same manner for several minutes at a time, until Miles decides he's done.
However, respond incorrectly (i.e. "No! That can't be!) and brace yourself. Because Miles will bang his palms on the table, shake his head, and emphatically repeat what he had just said.
And as you can see from the photo above, it's all very serious business.