I, of course, was alarmed and my focus moved from the dude, who I snapped at "No! I'm sorry, no!" to Jack, who had decided, immediately after running out the door, that it wasn't so awesome. In fact, he looked like he had decided it was very, very scary out there. But when he went to run back in the door, it was already closed because I was moving to catch him. So then he ran under the bushes in the front of the house and I called him and coaxed. Little by little he made his way back in my direction with me calling "Jack! Jack! Come on, buddy, the door is open! Run through it!" And then he did and all was well.
Somewhere in there, the dude left. I think he realized he had lost the sale.