We forgot one important point from yesterday’s Q & A about Banksy. The video Banksy posted on Instagram raises even more questions about the prank. Sotheby’s controls access to its sale room by ticketing the event. Yet Banksy’s video suggests more than one confederate is in the audience when the device was triggered. Notice there is a close shot of Oliver Barker hammering the lot. Then, seconds later, there is phone footage of the work of art engaging. Each vantage point is on the opposite side of the sale room.