Infact he has quite the leg to stand on. He was DM'd imagine if it had been his capital and there had been a warrior 2 turns away but before the borders has expanded more than once, if you get to a particular place you can attack the capital in two turns but because the player used to moves in succession the first to move into position which the defender can see the second to move outside the capital.
I can point you to that cfc isdg thread for further details
whilst the details are not exactly similar the principle is.