After the first volley of throwing knives, he fishes around for more knives to throw, while at the same time working on prepping to spit venom into the eyes of the knight if he happened to get close. He had used up only 10 to 15% of his venom reserves so far, so he was fairly confident, even though he had been stabbed in his side and his thighs on one side. Though he had thick scales as a snake, the stabbing blades still worked their way into his flesh.
He opened his mouth very wide, whipped around to face his persuers, and spit a wad of neurotoxic poison right into the closest knights eyes.