Quote from Zhorom
I don't think he's hacking. If he's facing a different direction while attacking you, it's probably because of lag.
Zhorom has it right. It is probably a combination of him and yourself lagging, but probably more him than you. You can see him swinging his sword where you previously stood and then see him adjusting his swings when he realizes you moved. It doesn't help that he has a block on his head so it is hard to see which way he is facing, but it looks to me he is facing towards you.