He struck at you at least 4 times in 30 seconds right? You mean you just left him alone but he continued to strike at thin air in your general direction? That seems strange. As far as what is supposed to be done when he strikes - I can't answer that. I've been bitten so many times over the years that it doesn't phase me anymore (BP's are rather mild compared to Bloods, water snakes, etc), But the 1st dozen or so times resulted in me flinching and withdrawing my hand. Very wrong I have come to believe. There are lots of YouTube videos on the subject more helpful than me, but I would simply suggest not reinforcing behaviors which could become very troublesome later on when he is 4' long weighs 3 pounds. Part of that entails not leaving him alone because that does indeed encourage more of the same behavior. Cup him in your hands against your body. Biting, he should learn, is futile and a waste of energy. He wants to be returned to his hide, so permit that only after he has calmed down. Good Luck.