I see this as a strategic move.
Give the opponent the impression they're in a position to advance, let them unsiege, and take them out in transition to their next siege point.
Fake left, go right, strike quick.
read other Anons' comments in this bread and last before you start flipping out.
Listen carefully to his words (we all know words matter) and try to convince yourself this was a concession.
If you can, you ain't thinkin' straight, hun.
Sauce?